A naturally beautiful, seemingly bottomless deep blue spring.

A scenic UNESCO site that doubles as a habitat for various forms of wildlife.

Where mountaineers were checked for lice before entering the city.

The memory of the ancient unit of measurement of local builders.

These elaborate gothic monuments honor Verona's medieval lords.

The big toe of this towering monument to a Croatian national hero is worn from years of superstitious rubbing.

When a supermarket opened up shop within a medieval building it became protected by UNESCO on a technicality.

The silly symbol for an underground protest group is now scattered around the city.

This roadside monument commemorates the huge weapon built by an Ethiopian emperor's hostages.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

Poland's oldest surviving university building holds a wealth of historic science instruments including some used by Copernicus.

An underground city of salt.

A memorial to the beloved brown bear that served in the Polish army during World War II.

A collection of modern and vintage pinball machines housed in the cellar of a 15th-century building.

Where Stoddart and Connolly suffered in the infamous Bug Pit.

Looking for a unifying history, Uzbekistan finds its answer in a 14th Century Turco-Mongol conqueror... despite the fact he wasn't Uzbek.

Giant cauldrons overflow with Uzbekistan's favorite rice dish at this cavernous dining hall.

18m long sarcophagus of a constantly growing dead prophet.

This "tower of death" has acted as an observatory, a religious hub, and an executioner's lair.

Light still pours into the ruins of this ancient Islamic observatory.

Ancient barriers wrap around what was once an important stop along the Silk Road.

The Avenue of Mausolea is a series of grand palatial tombs.

The celebrated eyesore created by starry-eyed sweethearts.

If you look closely at the oldest bridge in Paris, you might notice hundreds of ugly faces leering from its sides.