Thousands of tourists and residents in Cologne affix "love padlocks" on the Hohenzollernbrücke Bridge to symbolize their affections.

A church filled with the bones of hundreds of virgins martyrs—or so they say.

A bronze replica of an elm tree that honors the victims that perished in Pawaik Prison.

Seventy-five miles of limestone caves host more than a million bottles of wine beneath a sleepy Moldovan town.

These 18th-century paintings of Warsaw were used to reconstruct the city after World War II.

Stare out over the lagoon and beyond from this 10th-century campanile on the island where the city of Venice began.

The remains of the left arm of the levitating philosopher-saint are kept in a 13th-century Neapolitan basilica.

A magnificent Neogothic tomb hides within this Italian fairytale-like forest.

This curious building hides eclectic details like medieval gargoyles alongside naked angels and Art Nouveau mosaics.

Drink wine handed out through a window as part of an age-old tradition.

Small on the outside, big on the inside, this church is an astonishing act of visual deception.

Venice's island of the dead.

Medieval torture techniques with a modern conscience.

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.

Dramatic sea stacks adorn the coast of this small village on the Adriatic coast.

One of seven Jewish catacombs in Rome and one of only two open to the public.

Pompeii's less famous neighbor is still revealing her secrets.

At the crypt of St. Mary of Eulogies and the Dead you are left alone to ponder mortality among piles of skulls.

An unassuming Swiss institution houses Europe's largest toy museum.

This ossuary is more than five centuries old and is heralded as one of the finest in Switzerland.

An amazing clockwork museum in the Val de Travers holds examples of various prestigious legacies horological history.

Zurich's evolution museum hosts a unique collection of skeletons among its natural history treasures.

The World Wide Web was created in this nondescript corridor at CERN.

Built as an anti-fascist tribute, this surreal Yugoslav memorial became an unwelcome symbol after the Croatian war for independence.