The ruins of a megalithic monument sit right in the garden of a luxurious Maltese resort.

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

A statue in Budapest's Liberty Square honors the former U.S. president's efforts to end the Cold War.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

Museum dedicated to the terror regimes of Hungary.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

No one knows the meaning behind this giant sculpture of a nude woman with a fork riding a rooster in Havana.

This imposing memorial contains the remains of Che Guevara — and 29 other guerrillas who died with him in Bolivia.

Thousands of well-dressed mummies below a monastery.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

A contemporary art installation housed within a Gothic cathedral.

Da Vinci's equestrian statue, 500 years in the making.

An ossuary built in 1210 to collect bones from the Ospedale Maggiore of Milan.

A sculpture serving as an homage to Pope John Paul II.

One of Catholicism's four major basilicas has a series of papal portraits that are said to predict the end of the world.

A treasure trove of Renaissance-era funerary art in a Roman church built on top of Nero's grave.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

Museum dedicated to literary greats of the Romantic Period is also the home in which Keats met his untimely end.

A Nesting Doll of Churches.

2300-year-old Roman road connecting the empire.

The yawning maw of this pagan visage is said to bite off the hands of liars.

Every inch of this chapel is covered in craftsmanship from across the world.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.