Legend says this sacred tree was a gift from goddess Athena.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

The ruins of an abandoned medieval city where the last Byzantine emperor was crowned.

An ancient octagonal weather station named for the eight Greek gods of wind.

The hallucinogenic center of the ancient world.

Monasteries on rock pillars, once accessible only by frayed ropes.

One woman's Viking Castle on Lake Tahoe.

Walk through the history of American pop culture.

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

This Boston medical museum features the skull of the famous medical case of Phineas Gage.

For 20 years, this whale skeleton has been slowly dripping oil on the floor of the museum where it hangs.

Dedicated to the art and science of glass in equal measure, this space is as much laboratory as museum.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

Every equinox this Maya pyramid puts on a spooky ancient light show.

Montreal's giant farmer's market is a foodie's best friend, especially in the winter months.

The birthplace of America's favorite fruit-flavored mystery dessert.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Inside this museum, the history of the Walt Disney Family empire is on full display.

San Francisco's newly reopened hands-on science museum.

Olfactory delights in San Francisco's Botanical Gardens.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

A psychedelic labyrinth on the San Francisco bay.

This little museum is built on a theater that was once a wildly elaborate speakeasy.

The sweetest graveyard in the world is filled with headstones for dearly de-pinted ice cream flavors.