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.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

A drawbridge named for a potentially intersex Polish national who fought alongside George Washington during the American Revolution, and an example of "Pulaski Red".

This neighborhood grocery houses a treasure trove of Eastern European delights.

The last remaining 19th-century mile marker along the historic Ocean Parkway.

This monument to a veteran of the Mexican-American War is one of only two in Manhattan that serve as an actual mausoleum.

A grand New York post office that is home to mailman Santas, scraps of postal history, and a pneumatic mail system.

An aptly-named street near the birthplace of the modern LGBT rights movement.

The façade of this building looks like a bingo board, but it's really a giant clock by a famed graphic designer.

Manhattan's lighthouse, erected at the insistence of the unsinkable Molly Brown.

The former sign of this immortal music venue is just that--undying.

Long the exclusive domain of birds and vagabonds, this little-known Central Park peninsula is open to the public once more.

The remains of a community that was forced to move for a dam that never materialized still rot in this Pennsylvania park.

After starting as a whimsical tourist attraction that eventually found its way to ruin, these renovated canals offer a lush and exotic locale on the Pacific Coast.

A sign at the end of the Santa Monica Pier marks the traditional end of the legendary American highway.

A second generation sun-powered marvel lights up the night.

Under the shadow of its towering parent tree, a rare specimen of sequoia produces ghostly white leaves.

The remains of a 12th-century chapter house in Golden Gate Park.

Olfactory delights in San Francisco's Botanical Gardens.

Faceless white figures loom over the city from the rooftop.

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

Early prototype for Frank Lloyd Wright's Guggenheim.

Longtime headquarters of controversial boys' club for the world's wealthiest and most powerful.