This subterranean disco dance club in a Cuban cave comes with bright lights and a dark legend.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

A large statue of Pope Gregory XIII in Bologna was disguised as Saint Petronius to avoid destruction.

Time has been frozen at this station since the bombing in 1980—or so it was believed.

An extraordinary collection of 18th century anatomical waxworks.

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

The graveyard is filled with beautiful funerary art and boasts breathtaking views of Florence.

Those who own or stay at this 500-year-old, allegedly cursed house often meet terrible fates.

An easily overlooked memorial to a Ukrainian famine-genocide that killed over 4 million people.

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

Government testing at the asylum briefly explored using marijuana as a "truth serum" on Nazi prisoners of war.

An Industrial Revolution-era public work that purified water using nothing but sand.

The Byzantine, pre-Columbian, and medieval art at this stately mansion are some of the most under-appreciated collections in D.C.

A derelict bit of transportation infrastructure hidden in the woods.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

Enormous piles of historically significant stones, dumped by Congress in a forest, and abandoned for 60 years.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

Long-abandoned trolley tunnels just a mile away from the White House are turning into an art space.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

A small window on Via Piella offers a lovely and rare peek at Bologna's lost canals.

A new sculpture calls attention to climate change in the centuries-old city it threatens.

Originally a leper colony, the island is now an Armenian monastery that's home to an incredible manuscript library and eclectic museum.

Hanging within this medieval church are the bones of a beast allegedly slain by a fourth-century saint.

The plague quarantine island home to the alleged "Vampire of Venice."