Touching this 18th-century Scottish philosopher’s toe allegedly conjures good fortune.

A six-ton wedding present for the King of the Scots.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

Stone memorial that's said to predict the death of the pope and the site of the Cadaver Synod.

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

An alchemist's "magic door" stands in the middle of a Roman park.

A Nesting Doll of Churches.

A rather vulgar example of the transition from Latin to the Italian vernacular.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

What looks like a suicide in progress is actually a statue of Sigmund Freud.

The first museum in the world devoted to sexual gadgetry.

The hidden lair of an alchemist rediscovered in a 2002 flood.

Berlin's old airport.

Tiny memorials honor individual victims of the Holocaust.

Germany's Glienicke Bridge has a shady history of clandestine meetings, espionage, and spycraft.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

This unique building in the main square stands out among the city's typically Baroque architecture.

Overshadowed by other, more famous Maltese catacombs, this ancient burial chamber has one of the best examples of a ritual agape table.

The remains of a 1st-century aristocratic Roman town house featuring beautiful well-preserved mosaics.

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

Stone Age solar temple is aligned with the sun on each equinox and solstice.

This stunning concert hall has become a symbol of Iceland's national recovery.