Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

Artifacts from a battleship sunk at Pearl Harbor displayed in the Capitol building of its namesake.

A museum and tribute to a brave profession.

A self-built castle made by a mysterious man.

These markers are used to document elevation changes around the famed dam.

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

Thousands of artifacts relating to human sexuality, including the world's largest sex bike.

San Diego's most historic and haunted home.

This historic graveyard was partially paved over to create a streetcar line.

Swarms of butterflies cannot compare to the awe inspired by the publicly-funded nakedness once displayed in this sunken garden.

Built for an exposition in 1915, these horticultural displays have stood the test of time.

High on a hill overlooking Los Angeles lives a world famous, high-power conical Tesla Coil.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

The biggest museum dedicated to insects in North America, one of the largest in the world.

This small museum is dedicated to making sure the history of the natural ice industry doesn't melt away.

This inexpensive lodging house was once a prison notorious for its inhumane practices.

Louise Bourgeois' 30-foot-tall steel spider sculpture.

Canada's subterranean Cold War museum has doubled as a movie set.

A Victorian-style home known as the “Castle on the Hill.”

This working class sculpture pounds his hammer all the livelong day.

A museum dedicated to the history and exploration of both popular music and science fiction.