This museum boasts the ninth-largest collection of insects in North America.

Known as the "Dodo Manège," this carousel features a herd of animals that have disappeared—or may be gone soon.

The world's largest collection of witchcraft regalia.

Two New York rooftops are home to the largest rooftop soil farms in the world.

Private collection of art inspired by cabinets of curiosity.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

A natural history museum with an extensive collection of bird dioramas.

Every autumn, this hillside is ablaze with red summer cypress.

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

Last stop before the top of the highest peak in the world.

The most decorated dog of World War I is preserved in the Smithsonian.

A submerged village appears when dam levels drop.

An underwater city for the dead.

A turn-of-the-century architectural marvel built on healing mineral springs and salt licks.

A suspended garden, now gone, once hung in the middle of this abandoned church.

The largest earthwork effigy in the world.

"The Wonder From Down Under," a worm shaped museum celebrating the endangered Giant Gippsland earthworm.

The word 'wunderkammer' translates as 'wonder-chamber'. This Wunderkammer is both a museum and a retail store.

Outdoor art exhibition made of classic Tetris pieces.

The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Ancient snack bar of the Roman Empire re-opened.

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

Hear the quietest sound from across the dome.