Hundreds of enormous icebergs drift through this waterway every year.

Also known as the Square Colosseum, this building is a prime example of fascist-era rationalist architecture.

Only a fragment of this 15th-century Dance of Death survives today.

This 17th-century structure is a beautiful testimony to traditional Persian architecture

You'll find just about anything in this funky Tbilisi flea market.

The first thermometer made with the almost-universal temperature scale is backwards.

Thousands of well-dressed mummies below a monastery.

An abandoned shopping gallery built during Fascist Italy tucked in the center of Palermo.

This skeletal, unfinished Gothic church once housed a miraculous masterpiece by Raphael.

This amazingly preserved Doric temple was abandoned before it was ever completed.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

The second-largest collection of runic calendar staffs in Sweden.

The official meeting point for the oddly named governing assembly of ancient Sweden.

This mysterious runestone embedded in a church wall is linked to the medieval cult of Saint Erik.

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

A cluster of historic bathhouses built on the famed hot springs that gave the Georgian capital its name.

The little-known second castle that William the Conqueror built in York.

This Parisian gem is one of the most incredible ethnographic museums in the world.

The enormous isokinetic structure hangs within a science center in Estonia.

A plaque marks the house in Stockholm where the French philosopher René Descartes lived up until his death.

This statue and park honor the Swedish chemist Jacob Berzelius, one of the founders of modern chemistry.

This medieval cathedral houses stained-glass windows featuring saints and pretzels.

This amazingly well-preserved villa just outside Pompeii boasts rare examples of ancient Roman paintings.

Uppsala's adorable feline sign celebrates a popular children's book set in the Swedish city.