From an alien theme to a one-of-a-kind pizza, a foodie has lifted the lid on what the most unique McDonald's restaurants in America have to offer. 

Dylan Huynh from California set of on a McNugget filled adventure to visit five of the country's wackiest outlets in a bid to rank which one is the 'coolest McDonald's ever.' 

In a YouTube video documenting his trip, he starts his journey in Roswell, New Mexico, where he checks into a McDonald's shaped like a UFO with 'little alien statues' installed outside.

Inside the restaurant, he says it 'actually feels like you're in a UFO' with 'metal plated walls' and even an 'astronaut Ronald McDonald' hanging from the ceiling.

Dylan Huynh from California set of on a McNugget filled adventure to visit five of the country's wackiest McDonald's. He starts his journey at a UFO shaped eatery in Roswell, New Mexico

Inside the restaurant, he says it' actually feels like you're in a UFO' with 'metal plated walls'

In the main dining area, Dylan found an 'astronaut Ronald McDonald' hanging from the ceiling

The colonial era McDonald's, dubbed the McMansion, is set in a 19th-century former farmhouse in Hyde Park, New York

As he opens the 'fancy door' and steps inside, Dylan is shocked by the interiors with a 'grand staircase leading up to the second floor' and exposed wooden beams in the ceiling

US' MOST UNIQUE MCDONALD'S AS VISITED BY DYLAN 

Dylan Huynh from California set of on a McNugget filled adventure to visit five of the country's wackiest outlets:

• UFO-themed restaurant in Roswell, New Mexico: 'Feels like you're in a UFO'
• The McMansion in New York state:  'Pretty to look at but not fun'
• World's largest McDonald's in Orlando, Florida: 'Sells McPasta and McPizza'
• McDonald's HQ in Chicago: 'The global menu rotates every three months'
• CosMc in Illinois: 'Menu designed to boost your mood into the stratosphere'

In terms of the food, Dylan didn't find anything unusual, so he opted for a portion of 20 chicken McNuggets and a McFlurry. Both got his seal of approval. 

Before leaving, he snapped a photo with a 'cool alien statue' and bought something from the gift shop. 

Next up, Dylan heads to what he deems the 'world's fanciest McDonald's.'

The colonial era McDonald's, dubbed the McMansion, is set in a 19th-century former farmhouse in Hyde Park, New York. 

The classical building was saved from being knocked down by local activists and it was given landmark status.

In his YouTube video, Dylan reveals that it became a McDonald's in 1991. 

As he opens the 'fancy door' and steps inside, he is shocked by the interiors with a 'grand staircase leading up to the second floor' and exposed wooden beams in the ceiling. 

He adds: 'It literally feels like I'm inside someone's house, a very rich person's house.'

Along with a fancy door, he found 'fancy lights, fancy windows, fancy plants, even the trash cans were fancy.' 

While he was impressed by the regal interiors, Dylan wasn't so enthused about the ambience. He found the restaurant seemed very empty, with 'no kids' and 'just fancy looking old people.'

As he sits down he says: 'I don't know how to explain this but I feel very uncomfortable in this McDonald's. I feel like I have to whisper.

The third stop on Dylan's whirlwind tour is the world's largest McDonald's, which is located in Orlando, Florida

The sprawling restaurant, which opened in 1975, has a floor area of more than 19,000ft

Dylan reveals that the world's largest McDonald's is 'the only McDonald's in the world that sells the McPasta and the McPizza'

The pizza also gets his seal of approval, despite the floppy base not filling him with high hopes

'I'm just going to go right out and say it. I am not having that much fun at this McDonald's.' 

After finishing a portion of chicken McNuggets, Dylan leaves the restaurant with the farewell message: 'Goodbye world's fanciest McDonald's you are pretty to look at but very weird.'

The third stop on Dylan's whirlwind tour is the world's largest McDonald's, which is located in Orlando, Florida.

The sprawling restaurant, which opened in 1975, has a floor area of more than 19,000ft and along with a restaurant, it has a 22ft tall play area and an arcade with more than 100 games. 

Dylan reveals that it is also 'the only McDonald's in the world that sells the McPasta and the McPizza.'

As he walks through the restaurant, he points out some woodfired pizza ovens and he even passes an aquarium.

In terms of his food order, Dylan goes to town and spends $64 on a spread of treats including 'the usual chicken McNuggets,' an Oreo McFlurry, the McPasta and the McPizza.

Continuing on his quest, Dylan visits the McDonald's global headquarters in Chicago where they offer a global menu of their delicacies from around the world

Before he orders, the food experts says his initial impression of the restaurant is that it is 'very clean' and 'very modern,' with 'people wearing suits in the kitchen'

When he visits, he decides to order a 'BBQ bacon stack' burger from the UK

A 'filet-o-shrimp' burger from Japan gets the thumbs up from Dylan

Out of the three items, he deems the Korean salted caramel McFlurry with Oreo the winner and he puts in a plea for it to come to the states

He says the colorful bowl of tortellini he orders is 'a lot better' than he expected and he adds that it 'might be better than Olive Garden.'

The pizza also gets his seal of approval, despite the floppy base not filling him with high hopes. 

After having a fill and boxing the remnants up, Dylan heads to the arcade to play some games and he spends $120 on a gaming card. 

Lastly, he heads to the play area to test out the 'infamous big yellow slide.' 

Summing up the world's largest McDonald's he says: 'This place is the exact opposite from the McMansion. The McMansion was dull, gray and quiet [but] this McDonald's was very lively, very colorful and definitely not quiet.'

Continuing on his quest, Dylan visits the McDonald's global headquarters in Chicago where they offer a global menu of their delicacies from around the world.

Before he orders, the food experts says his initial impression of the restaurant is that it is 'very clean' and 'very modern,' with 'people wearing suits in the kitchen.' 

When it comes to the HQ's menu, Dylan explains that 'since McDonald's operates in over 118 countries, the global menu rotates every three months to highlight different locations.'

When he visits, he decides to order a 'BBQ bacon stack' burger from the UK, a 'filet-o-shrimp' burger from Japan and a salted caramel McFlurry with Oreo from Korea. 

Lastly, Dylan makes his way to the new restaurant CosMc, which is also located in Illinois

The brand - which launched in December 2023 and is named after McDonald's alien mascot from the 1980s and early 1990s - offers a range of colorful slushes, iced teas and coffees

He orders a s'mores cold brew which he deems 'pretty nice,' and a portion of hash browns which he says is 'nice' but on the smaller side

Lastly he tests a drink, which he asked the drive-thru attendant to surprise him with. He tells viewers that it the 'radioactive red' drink features 'popping boba' beans in it

Out of the three items, he deems the Korean invention the winner and he puts in a plea for it to come to the states. 

He concludes: 'Even though McDonald's started in America every other country has a better menu than the American one.'

Lastly, Dylan makes his way to the new restaurant CosMc, which is also located in Illinois. 

The brand - which launched in December 2023 and is named after McDonald's alien mascot from the 1980s and early 1990s - offers a range of colorful slushes, iced teas and coffees with names such as the Sour Cherry Energy Burst and Turmeric Spiced Latte. 

Some old McDonald's favorites also made the menu including its popular McMuffins.

As he nears the new concept restaurant Dylan says: 'It's technically a drive-thru... but from the pictures it looks very, very exciting.

'According to the CosMc website their menu is supposed to be otherworldly and it's designed to boost your mood into the stratosphere. I don't even know what that means but I'm excited about it.'

He orders a s'mores cold brew which he deems 'pretty nice,' a portion of hash browns which he says is 'nice' but on the smaller side, and an Oreo McFlurry, which he says always takes him back to his childhood. 

Lastly he tests a drink, which he asked the drive-thru attendant to surprise him with. 

He tells viewers that it the 'radioactive red' drink features 'popping boba' beans in it and a lemon and as he tastes it he winces in response to its sour taste.

Following his epic journey across America, Dylan crowns the world's biggest McDonald's in Florida as the winning restaurant, with its unique restaurant-style dishes and big yellow slide.