The final resting place for the remains of 143 Habsburg royalty.

Legends surround an ancient tree trunk riddled with nails for good luck.

These two 15th-century metal rods allowed people to check if they were swindled or not.

Physicist’s epitaph provides final confirmation to a career of turmoil.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.

A brutalist gem towering over the heart of Milan.

The secret medieval communication system will whisk your words above the noise of the crowd.

Third time's a charm, or in this case, two testicles are.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

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

An ancient Roman temple first dedicated to an emperor's wife is now a church.

St. Francesca Romana, patron saint of drivers, resides in the church she founded.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

These hut foundations are believed to be the residence of Romulus, founder of Rome.

A mysterious chasm in the heart of the ancient Roman Forum, the Lacus Curtius was once believed to be a gateway to hell.

This distinctive Crescent City tradition dates back to the days of horse-drawn carriages.

A snapshot of the city's fascinating voodoo culture.

By day this New Orleans square is for pedestrians, but by night it is a kingdom of kittens.

This cathedral dedicated to Louis IX, sainted King of France, holds many secrets.

Shop for books in the New Orleans house where William Faulkner once lived.

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

Once defending the city of New Orleans from invasion by sea, this fort faces an uncertain future.

In 2010, Nicolas Cage purchased two plots in this cemetery using one to construct this strange pyramid mausoleum.

This historic "City of the Dead" lies prominently in the center of New Orleans' famous Garden District.