Overlooked amid the tourist bustle of Florence, this museum is dedicated to the craft of stone inlay.

This lush forest valley was once mined for lumber to the extent that it was once nicknamed "The Pennsylvania Desert."

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

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

This historic park site contains the last remnants of a once bustling canal system.

Final resting place of a New Haven urban legend.

The cave where two British judges hid in exile after sentencing the king to death.

The ruins of an abandoned 18th-century town that is slowly being reclaimed by the forest.

The kind of mixed-up place that drives archaeologists crazy.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

Pompeii's less famous neighbor is still revealing her secrets.

Five candy-colored villages on the Italian Riviera.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

This narrow canyon has been carved by the river over thousands of years into spectacular and curious forms.

Stand at the center of this lakefront sundial, and you'll become part of the timepiece.

A portrait of the Charter Oak hangs in a frame made from the Charter Oak.

This lavish room at NYC's French Embassy is a rare relic from the end of the Gilded Age.

More than 21,000 images fill this overlooked gem of a prehistoric site.

According to local lore, this narrow passageway through two large rocks was accidentally created by the devil himself.

Thousands of migrating monarchs overwinter clustered amongst the eucalyptus trees.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

2300-year-old Roman road connecting the empire.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

A gargantuan crystal kingdom.