This church is named for one of the most dramatic tales in the early Christian church.

Despite the name, these small saltwater swimming pools have nothing to do with the Romans.

The bones of prehistoric animals and early signs of human habitation have been found inside Malta's "cave of darkness."

For over two centuries, this palace served as a residence for the Holy Roman Inquisition's leaders, a courthouse, and a prison.

So opulent and massive it was once dubbed a palace, this hotel's doors closed temporarily in 2007 and failed to reopen.

The eyes and ears of this tower keep watch over Malta’s Grand Harbor.

Valletta’s outdoor theatre stands within the ruins of a 19th-century opera house.

This Stone Age solar temple aligns with the sun on each equinox and solstice.

This 50-foot-deep sinkhole created in the 14th century is home to rare plants and fungi.

Next to the Leaning Tower of Pisa is a cemetery home to ancient sarcophagi and disturbing murals.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

The first botanical garden, a feather in the cap of the Grand Duke of Tuscany.

A local student's chance encounter with Keith Haring led to the creation of one of Europe's largest murals.

An abandoned Jewish sanatorium is tucked within the woods of Poland.

A well-worshipped shrine to the Virgin Mary nestled inside the last of Zagreb’s historic gates.

Where the lovelorn find a home for their sentimental keepsakes.

A World War II evacuation tunnel turned into a history display of Croatian state and people.

A safe sanctuary for rescued shelter cats with an imaginative, glitter-infused experience

Once a state-of-the-art tuberculosis treatment spa, these ruins are now ruled by paintball players.

This one has sailed five times as far as Sir Francis Drake's famous ship.

An incarceration museum on the spot of possibly the oldest prison in England.

Despite the name, this 16th-century structure in Galway wasn't built by the Spanish.

A moody and picturesque riverside ruin overgrown with vegetation.

This prison on the Maltese island of Gozo is almost 500 years old, and they have the graffiti to prove it.