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

This collection of Wild West movie memorabilia also claims to hold some secrets of the Lost Dutchman's mine.

An artsy hidden staircase leads to breathtaking views of San Francisco.

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

A colossal strolling Pinocchio that was greeted with more outrage than whimsy.

The art museum is decorated with creatively remodeled pre-Nazi swastikas.

Hans Christian Andersen for the postmodern world.

A miniature train-ride through Slovenia's largest cave system.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

Machismo turned on its head: the lady's hand goes to the dude with the bigger brain.

This English-inspired Maryland garden is home to acres of opulent plant life including bushes shaped into an entire fox hunt.

This free, take-a-book shop seems like a trick but isn't.

Walk a trail through a historic Quaker town that outlawed slavery in 1777 and was a major waypoint on the Underground Railroad.

An astounding collection of medical specimens, including bits of President Lincoln.

A secretive collection featuring objects that were designed specifically for U.S. intelligence operations.

An original apothecary from 1792.

The United States Capitol's former columns still stand.

An extensive, if one-sided, history of U.S. law enforcement's war on drugs.

Bar full of oddities, specimens, artifacts and homages to the great dime museums of the past.

Giftshop catering to cryptozoologists and anyone with a sense of humor.

This lonely waterfront memorial to the men of the Titanic was erected by the "Women of America."

An atomic bomb-proof strongbox protects the U.S. Constitution from terrorists and thieves.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.