A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

This basilica is dedicated to two saints, one of which is known more for his famous quote.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

Notorious artist squat renovated into legal studios.

A random tree outside a Budapest hotel has become a DIY shrine to the late singer.

A whimsical bridge adorned with decorative dragons.

Budapest's Communist-era statues, banished to the suburbs.

Possibly the world's largest hourglass only needs to be reset every New Year's Eve.

A two-way chairlift system between Zugliget and the highest point in the city.

This quaint Hungarian railway system is operated exclusively by children between the ages of 10 and 14.

One of Hungary's most influential places of learning is also home to one of the world's most beautiful libraries.

Monuments don't get much more metal than these three giant viking swords planted in a Nordic hill.

This "preacher's pulpit" once used for pagan ritual, is home to a new, and dangerous ritual.

This emotive sculpture was originally created for the 1878 World's Fair.

The video game-themed street art first popped up in the French city.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

Tucked away near more famous landmarks lies a statue meant to symbolize the confluence and continuing development of human culture.

Once the home of a hermetic monk, this cave now houses a small church.

A 19th-century artistocrat's mansion, turned into a library, hidden in a modern library.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.