This ancient altar emerges from the thick forests to reveal the mysteries of Etruscan sacrificial rituals.

Gigantic mosaic sculptures of the figures on Tarot cards fill this colorful Tuscan garden.

Geothermal waterfalls in Tuscany.

According to a local legend, this bridge was constructed by an astrologer with the help of the devil.

These pillars at the main entrance of this church are actually a hidden musical instrument.

In this museum, visitors are invited to touch the art.

A series of caves, tunnels, and wells filled with fascinating figures and symbols.

A museum dedicated to secret surveillance.

Bronzes and busts that once stood in the city's main squares are now relegated to a small hidden courtyard.

In the heart of Tirana, this underground nuclear bunker has been transformed into a museum.

An Albanian monument to the Communism that nearly crushed the country is now a crumbling wreck.

Five candy-colored villages on the Italian Riviera.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

Hidden beneath a beautiful overlook you’ll find the history of the city depicted in comic strip format next to a pay toilet.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

The world's oldest bookshop still in operation.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

The prototype for all Nazi concentration camps.

Blitzkrieg bop your way through Berlin's Ramones Museum.

A restaurant and observation deck built in a unique broadcasting antenna.

The fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”

A complex, nine-layer maze on the grounds of a Venetian doge's playground.

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