A makeshift shrine to the late rock star is still kept up on the nondescript façade outside 1 Logan Place.

Memorials at a Florence railway station remember the citizens who were deported from Italy and sent to extermination camps.

Legend says this mysterious stone head belongs to a woman who was petrified by an alchemist.

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

Overlooked amid the tourist bustle of Florence, this museum is dedicated to the craft of stone inlay.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

The famous sculptor left his mark on this Italian wall in an internationally protected example of street art.

A large grotto built in the 16th century amidst Florence's famous Boboli gardens.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

Eighteen miniature death-scene dioramas.

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

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

The walls of Germany's Parliament still show the scars of the Red Army takeover in World War II.

Someone loved this song enough to carve all of its lyrics onto a tree trunk in a Berlin park.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

A line of disused military bunkers built to defend against Nazi invasion lies hidden on the outskirts of the city.

The alpine falls where Sherlock Holmes apparently met his demise can actually be visited.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

The final resting place of the "father of special effects."

Noirish green neon marks the location of one of the oldest private detective agencies in France.

A subterranean shelter remains intact under a busy Paris railway station.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

The oldest stone house in Paris was built by its most famous alchemist.