This hidden Art Nouveau courtyard is an opulent feast for the eyes.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

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

Architectureal fantasy quarter of Rome.

This poignant art installation raises awareness of violence against women.

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

The mark of the Devil's horns on a marble column in Milan.

The odd depiction of the Virgin Mary and baby Jesus is rooted in the Catholic Church's eradication of Catharism.

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

Long-abandoned art nouveau baths beneath Milan's Piazza Oberdan.

One of the world’s smallest bars, just 13 square feet, is brimming with speakeasy flair.

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

This London marker celebrates the spot where the world-famous English band was founded.

The remains of the vast manor that once belonged to Lord Kira, villain in the 47 Ronin story, is now a shrine dedicated to the incident.

After a profound show of devotion for his master, a dog becomes the symbol of loyalty for an entire nation.

The legendary birthplace of the Japanese maneki-neko is dotted with hundreds of lucky beckoning cats.

Scores of vintage street lamps shine along L.A.’s Miracle Mile.

Giant Redwood-themed cafeteria operates under the golden rule, "Dine Free Unless Delighted."

This weird abode has inspired everything from the "House On Haunted Hil" to a robot hunter's pad.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

Shop selling 500 flavors of soda has something for everyone.

Hidden in the hills of Hollywood, this secluded Oz-themed garden is dotted with dozens of thrones.

America's most famous piece of self-built architecture.

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.