Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The castle used by the Danish Royal Family as a hunting retreat.

Copenhagen's "other" little mermaid marks the historic location of past sea maid sightings.

After funding was cut for a memorial to the Danish author, the sculptor had his statue ceremonially lowered into the city harbor.

This pair of gilded girls atop an Art Deco building in Copenhagen were built to function as a weather indicator.

The final resting place of the author who gave us the Little Mermaid, the Ugly Duckling, and many more beloved fairy tales.

Four alabaster giants contemplate the tides on the shore of Denmark.

This modest marker near Notre Dame identifies the very center of Paris.

One of Jeff Koons’s largest sculptures and his first commemorative work.

Indents in the pavement are all that remain from a grisly death machine in Paris.

A medieval, mosaic-lined baptistry built by a heretical Christian sect.

Psychoanalyst Carl Jung reported a paranormal experience after visiting this mosaic-lined Roman baptistry.

This 6th-century church has the largest and best-preserved collection of Byzantine mosaics outside Constantinople.

An incredible mosaic-lined monument said to have held the remains of an ancient Roman empress.

Italian poet Dante Alighieri is entombed in this small mausoleum in Ravenna, and his hometown of Florence has never been too happy about it.

The world's largest bamboo labyrinth is a living demonstration of the plant’s immense potential.

Pilgrimage site for star-crossed lovers.

A young Italian couple has been locked in an embrace for over 6,000 years.

A small villa said to have inspired the design of the court jester at the heart of Giuseppe Verdi's 1851 opera.

A medieval tower with a suspended iron cage used as an open-air jail for criminals who were exposed as a warning.

It took more than 300 years to build this church, which is home to two sacred vessels believed to hold the blood of Christ.

From Carthage's Hannibal to riders of the Tour de France, many have crossed this scenic route through the Alps.

Unable to build support structures on glaciers, the engineers for this tramway were forced to design a unique system.

One of the most well-preserved castles in Italy also contains a rare medieval example of a port fortification.