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

A Nesting Doll of Churches.

A wonderful display of arts and crafts handmade by local artisans in the Southern Appalachians.

This giant iron playfully pays tribute to an early 20th-century architectural trend.

This statue once earned the distinction as one of the "Three Major Disappointments of the World."

Looking strangely like Rome's Colosseum, this unfinished tower has dominated the skyline for over 100 years.

Each of these gorgeous, intricately decorated rooms is painstakingly crafted to the scale of 1 inch: 1 foot.

This roadside attraction has been serving out its fair share of hearty folklore and chaos since 1858.

Largest tulip festival in America, includes fireworks, a parade, and a carnival.

A nondescript dirt lot hides an intriguing center of shamanic healing.

Enormous statue of the Emperor of the Mongols.

Climb to the top of the world's largest seated bronze Buddha.

Enormous pendulum helps keep Taiwan's tallest building from swaying.

Scores of vintage street lamps shine along L.A.’s Miracle Mile.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

The attic of a four-century-old canal house hides a clandestine church.

Where the author wrote her beloved "Little House" books.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

A free library to stumble across, one of many placed worldwide if you know where to look.

A small gallery and shop dedicated to an ancient style of hand-printed textile.