A 200-year-old bar in the historic French Quarter refuses to give up its place in history, nor its role in securing ours.

Of the many Jesuit missions in South America, this complex is one of the best preserved.

This island castle contains enough secret passageways to support a season of Scooby-Doo episodes.

An abandoned castle owned and ignored by Masons carries a cursed history.

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

The Roman Emperor's lost summer home and grotto full of enormous sculptures sit along the Italian seashore.

The original film set of Luke Skywalker's Tatooine home from the 'Star Wars' trilogy.

A fifth-century temple improbably built into the side of a cliff.

A 19th-century subterranean reservoir repurposed as a contemporary art cave.

Of the many chalices in the running for the Holy Grail, this one in Valencia Cathedral sure looks the part.

France's most famous cemetery, with some of its most curious tombs.

Hidden in a high mountain cave, this hermitage dates back to the ninth century.

This Elizabethan hedge maze is one of only six in North America.

Hidden behind Lincoln's head is a 70-foot-long chamber containing enamel plates documenting American history, sealed in a teakwood box in a titanium vault.

This one-time health resort was used by aristocrats around the world.

A nun spent 16 years painting the stunning Celtic mural that covers the interior of this WWI memorial.

This grave marks the final resting place of pioneer John Chapman, better known as Johnny Appleseed.

This medieval sanctuary's tree-framed door looks like a portal to a mythical realm.

Centuries of warfare, tragedy, executions, and poetry come together in this 13th-century fortress.

This Central New York ghost town was once a prosperous railroad community.

In the bowels of a 19th-century brewery lurks a fine-dining restaurant offering an array of themed feasts.

The grotto where Saint Ignatius of Loyola lived as a hermit for nearly a year.

An abandoned Gold Coast-era mansion once intended for the exiled ruler of Albania, who never arrived.

Once the most densely populated place in the world, this island is now a ghost town.