Hollywood's oldest hotel is the site of the first Academy Awards, the birthplace of Marilyn Monroe's career, and the home of Montgomery Clift's ghost.

The sole surviving relic of the San Francisco neighborhood cobbled together from old horsecars and streetcars.

George Lucas donated this park to honor the birthplace of his two biggest movie franchises.

The southernmost outpost of the Russian Empire in colonial America.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

Those who own or stay at this 500-year-old, allegedly cursed house often meet terrible fates.

The remains of an Aztec school and various intriguing artifacts lie below a modern cultural center.

Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

A bronze statue of the famed Prussian naturalist commemorates the year he spent in Mexico.

High winds can make this one scary landing.

This black shoreline is made up of exploded lava particles.

This 40-room dwelling tucked within a cliff was built by the basin's prehistoric residents.

One of the last remaining Carpenter Gothic churches is situated on a wildflower conservatory overlooking the bay.

The remains of a deserted steamboat sit rusting beside an old ferry pier and an abandoned train platform.

The first piece of public art dedicated to LGBT rights.

A restored 1920s cascade stairway provides one of the best views of Oakland's Lake Merritt.

No one knows how many bodies are in this vault in a Chicago public park.

A galaxy of glowworms—larvae of a gnat—hides deep in the belly of these caves.

You can walk through the first Boeing Air Force One, which famously carried JFK's casket from Dallas back to D.C.

This picturesque horseshoe weir was first built in the 1600s to prevent flooding in the town of Bath.

A 16th-century fountain marks the site of a lost medieval cemetery once filled with mass graves.

The Incas turned this ancient Wari aqueduct into an imposing defensive gate.

It took 82 years and four different plaques to finally get the story right.