In the days before house numbers, these colorful signs held clues about various buildings' purposes.

The Cycladic architecture makes this Athens neighborhood feel like an island paradise hidden in the shadow of the Acropolis.

A forgotten graveyard lost in the tangles of an overgrown garden.

This hidden art nouveau gem was designed by an architect in search of a national style.

The true meaning behind this sculpture remains unknown.

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

An existential riddle in the world's largest ancient castle.

One of the famous Czech artist's lesser-known Prague installations appears to be a glowing fetus affixed to a drainpipe.

Stroll through a wonderland of stupendous moss-covered trees.

This tangled English forest looks like something right out of a fairytale.

One of the oldest and certainly best preserved Cistercian abbeys still in existence.

Possibly the most beautiful carillon in the world, set atop Iron Mountain in Florida.

This dreamlike museum is filled with the works of an influential surrealist artist whose name you may have never heard.