With 3,000 bikes on display, the world's largest bicycle museum includes some famous rarities.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

This clifftop arch is a natural stunner.

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

A hidden oasis just north of Chicago's Chinatown.

In 2004, a Dave Matthews Band tour bus dumped 800 pounds of waste off a bridge and onto an unsuspecting tour boat below.

Also known as the Osaka Garden, this garden was originally built in 1893 as part of the World's Columbian Exposition.

Designed by Alfred Caldwel, this landscape showcases his vision of a native garden.

This $3 million model train takes you through Chicago, Seattle, and the thousands of miles in between.

Yo, Adrian!

The U.S. Supreme Court's secret Cold War relocation facility in the mountains of North Carolina.

This little gem of a museum is a hidden jewel filled with prehistoric treasures.

An ornate Art Deco tile mosaic representing Nebraskan life, both modern and prehistoric.

Colloquially known as “piss alley,” this narrow street filled with tiny bars and barbecue stands looks like it was pulled straight out of “Blade Runner.”

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

Paris' fabled purveyor of exotic taxidermy and natural history curios.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

This historic Illinois "Muffler Man" has been converted from axe-touting lumberjack to rocket-wielding space ace.

Town of spiritualists and mediums in Florida.

This glass-stain Mary attracted thousands of pilgrims until her head was shattered by a vandal with a slingshot.

During the American Revolution, this mansion hosted failed peace talks between the British and Americans.

The seat of Buffalo government is a gorgeous Art Deco palace.