The world's only international cryptozoology museum is host to an unrivaled collection of mysterious objects.

This historic Boston building has gone from personal estate to porn theater and back again.

The former home of Samuel Clemens and family remembers the happiest period of the author's life.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

World's first "penitentiary," meant to be humane, drove men insane.

This striking art museum holds an amazing series of curiosity cabinets.

Almost half-way between the Equator and North Pole.

The world's largest military aircraft cemetery.

When ecosystems collide in the arid Southwest.

The largest self-built castle in the U.S., six decades in the making.

At the tallest peak in Colorado, an electrifying mix of thin air, lightning, and rivalry.

Haunting and beautiful trees, doomed to die.

The drama of nature in full effect in this Nevada State Park.

Rare and gorgeous birds abound in this protected wildlife sanctuary.

A French chateau, failed utopian community, odd museum, and Stonehenge replica in rural Washington State.

A wall of chewing gum moonlights as collective art.

A giant Troll lurks under one of Seattle's oldest bridges.

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

The world's smallest park was dedicated in 1948 as the only colony for leprechauns west of Ireland.

The magic's in the hole!

The seamy, underground secrets of Portland's criminal past.

A six-ton wedding present for the King of the Scots.

Go deep down into the earth to experience the world of Welsh coal miners.