This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

The world's longest known cave system.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

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

A beautiful geyser under environmental threat.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

The oldest cemetery in New Orleans, resting peacefully for over 200 years now.

The final resting place of New Orleans' most famous voodoo priestess.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

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

Kentucky, Tennessee, and Virginia meet at this point in the Cumberland Gap.

This palatial botanical garden is home to one of the largest pipe organs ever installed in a private residence, and a piece of Wood's cycad.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.