One of the oldest used bookstores in the U.S. has been selling antiquarian treasures since 1825.

According to legend, this cavern holds the passage that Persephone used to travel to and from the underworld.

These artifacts were discovered during the construction of the airport, with some dating back to the Neolithic period.

Current docking place of the SS United States, the fastest transatlantic ocean liner.

This English-inspired Maryland garden is home to acres of opulent plant life including bushes shaped into an entire fox hunt.

The solitary grave of a schooner captain killed by lightning while serving biscuits.

A rural colonial settlement that contains the remains of a store and cooper.

This famous archeological mystery may be an ancient example of movable type.

The oldest cemetery of modern-day Athens blends the modern and ancient worlds.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

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

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

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

The only surviving choragic monument is a trophy awarded in 334 BC for the winning dramatic chorus.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

How this Pine Barrens hill got its name is uncertain, but on a good day the view from the fire tower is crystal clear.

Rising out of a clearing in New Jersey's Pine Barrens is an Aztec-inspired monument to the "Lindbergh of Mexico."

This historic iron-working village is now a ghost town so immaculate that it looks as though it was recently built.

The final resting place of New England's last "vampire."

This beloved marketplace mascot poops money and grants good luck.

A daily replay of the experiment that proved the rotation of the Earth.

Eccentric concrete mansion and museum designed and built by hand from the inside out.

Mysterious 500-year-old tapestries depict a unicorn hunt.