This headstone-like marker inscribed with three words has been an utter mystery for over a century.

One of the largest trees of its kind in California.

The world's largest outdoor organ is played weekly by one of just two civic organists in the U.S.

One of Hollywood’s favorite government buildings.

Whiskey lovers, this is your happy place.

A cobblestone alley with an interesting past.

It should come as no surprise that the best view of the Hollywood sign is from Batman's lair.

A sculpture of the famous photograph stands on San Diego's "Greatest Generation Walk."

Thomas Jefferson's estate is home to hundreds of varieties of historic fruits and vegetables.

The ruins of this Thomas-Jefferson-designed mansion have been left to crumble since the Christmas Day they burnt down.

Sculptures, jams, and the wild west collide at this folksy retreat.

This Cape Cod museum exhibits what it claims is the only authenticated pirate treasure in the world.

Ruins of the elaborate house where the enigmatic costume designer threw glamorous parties for New York's theatrical elite.

Eclectic collections, artwork, and some feline friends fill the writer's former home.

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

Once home to an aristocratic family and a workers' organization, this intricately tiled building now houses a chain restaurant.

These spectacular, symbolic serpents lie within the shadow of the Great Temple.

A disquieting Aztec sculpture displays hundreds of stone skulls representing the victims of human sacrifice.

Hidden for more than a century, the grave of the Conquistador remains forgotten behind these church walls.

Frida Kahlo's childhood home, now a museum of her life and works.

An unrecognized nation-state created in the 1820s to avoid taxes.

One of the few brewers in the U.S. experimenting with hop-free beers.

Annual celebration commemorating the 1965 sighting of strange lights in the town.

Even Henry David Thoreau found this glacial pothole irresistible.