Places thedoubtfulguests Wants to Go

The steepest classic funicular in the world glides along a dizzying incline.

The randomness of this wall of lava lamps helps encrypt up to 10 percent of the internet.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

The remains of a 37,000-year-old prehistoric society were discovered in this mammoth cave, one of the largest in Asia.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

A quaint miniatures museum that turns its focus towards the lives of Americans in a simpler time.

Largest magic museum in the United States with more than half a million pieces of memorabilia.

The Kalamazoo factory has 100 years of instrument-making, and one big wartime secret.

The largest catacomb system in the world.

A steam powered train that runs on city streets.

The contents of this safe survived a 37-kiloton nuclear bomb.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

Disney's abandoned animal island is now an overgrown ruin that was almost the coolest attraction ever.

London's smallest police station is barely the size of a phone booth.

Tucked away amidst some of the most famous addresses in the world is New York’s only fraction of a street.

America's only nuclear missile silo open to the public.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.

A 300-yard long natural tunnel runs through a ridge deep in the Appalachian Mountains.

First a horse rendering plant, then a 19th century landfill, this beach is full of glass from thousands upon thousands of broken bottles.

A historic 1890s architectural masterpiece with an iconic clock tower that, once open to the public, now faces an uncertain future.

Home to the infamous "Typhoid Mary" and the worst loss of life in New York's history prior to September 11, 2001.

An unassuming secret door once led to a legendary watering hole.