There's no excuse for staying in a bland chain hotel when you can check into a cave, a tipi or a room in the shape of a dog. Here's the quirkiest accommodation you'll find in the USA. Inspired to find somewhere exceptional for your next trip? Our friends at Secret Escapes have some excellent deals on US hotels and vacations.

Perhaps not one for claustrophobics, the luxurious Beckham Creek Cave Lodge is a 6,000 sq ft cave complex in the Ozark Mountains.

We couldn't have a list of unusual hotels without at least one in Vegas, and Circus Circus is among Sin City's most outlandish places to stay.

Portland's first (but no longer only) tiny house hotel has six mini homes you can stay in, each individually designed.

This quirky motel has been run by the same family since it first opened in 1950.

For a chain hotel, this Crowne Plaza is surprisingly unique.

You can't miss Dog Bark Park – just look for the giant beagle.

To stay at what claims to be the world's only truly underwater hotel you have to be a qualified scuba diver, or take a course on arrival.

Yes, as in the actual Queen Mary – the ship that once plied the Atlantic between the UK and the USA.

Getaway's collection of wooden box-like cabins are all either within two hours of New York City or Boston.

Right next to Rocky Mountains National Park, the 100-year-old Baldpate Inn looks fairly unremarkable from the outside.

The hotel is based on the inn from the 1913 mystery novel Seven Keys to Baldpate.

Just outside the gates to the Legoland park, this is the ultimate hotel for Lego-lovers.

Another place where you can sleep in an old train carriage, Featherbed Railroad sits right on the shore of Clear Lake.

Don't want to travel all the way to north Africa? Experience the Vegas take on the ancient Egyptians instead.

The brave can stay over on an abandoned US Coast Guard light station, 34 miles off the coast of North Carolina.

Arrive by night and you'll get an immediate inkling there's something different about The Roxbury.

Just outside Capitol Reef National Park you'll find a collection of 19th century-style wagons.

This 113-acre estate in Connecticut has 18 themed cottages, including a treehouse.

Another of the cottages comes with its very own helicopter inside, and while you can't sleep in the chopper itself, you can admire it from the bed. Want to book somewhere amazing for your next trip? Check out Secret Escapes' fabulous hotel deals.