Explore the dark underground corridors of this graffiti-covered former military fortification.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

These aggressively sustainable art homes look like something out of 1970's science fiction.

This candy-striped tower is the farthest east you can go in the United States.

A collection of outdoor art by renowned muralist Robert Dafford depicts the history of a flooded city.

This interpretive path lets you get up close and personal with dinosaur bones.

This southwest-styled home in Santa Fe claims to be the oldest house in America thanks to an ancient bit of foundation.

The oldest continuously occupied public building in the United States.

This sculpture perfectly models the molecular structure of a drug that was never produced.

A serene garden path lined with 36 haiku stamped into clay stones.

A sprawling collection of over 106,000 toys from around the world.

Wedding chapel's mysterious spiral staircase said to be miraculously constructed.

These Pre-Columbian petroglyphs contain representations of birds, deer, hunters, and even some early Native flute players.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

A nondescript Seattle restaurant inherited a piece of European history.

Leave a button on the jacket of this iconic Seattle clown.

Residents of Fremont in Seattle have considered it the center of the universe since the 1970s.

A 60-room castle constructed by a horse-racing heir.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

This rare example of Vancouver's Victorian past was the home of one of the city's first bookbinders.

A breathtaking flower tunnel bursts with beautiful golden blossoms.

One of the few surviving street funiculars in the world.

This little slice of the Netherlands in the Pacific Northwest blooms in a rainbow of color each spring.