An abandoned train station in Munich constructed for the 1972 Olympic games.

A subterranean display of public art and architecture.

Daily jousts and dancing barrel makers in Munich's mechanical clock.

The patron saint of spinsters grasps a container of dried blood.

A fearsome dragon clings to a corner of Munich's city hall.

The footprint of a frustrated devil in Munich's Cathedral.

The first passenger cable car in the world.

Inspired by the more famous Scrovegni Chapel, Cappella di San Giovanni contains several amazing frescoes.

Abandoned cemetery of the former Psychiatric Hospital of Volterra.

A sculpture serving as an homage to Pope John Paul II.

This ancient market is often referred to as the oldest shopping mall in the world.

This large, circular tomb is the final resting place of the first emperor of Rome.

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

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

A concrete mushroom that divided Stockholm residents for nearly a century.

This hole formed by a glacier is the largest and best-preserved of its kind in Stockholm.

From a distance, this structure looks like an ordinary office building but a closer inspection reveals a unique facade.

Outside a Viking museum sits a modern-day runestone made by a Swedish runemaster using traditional methods.

Sound travels strangely in this underground whispering gallery.

The world's first purpose-built indoor shopping mall opened in Sweden in 1955.

The first overseas server for Facebook in Sweden's tundra.

These coffin-like Brutalist balconies were inspired by a nearby mine.

The suspected burial mound of legendary Viking Björn Ironside.

His body was found mysteriously preserved in a Swedish mine over 40 years after his initial disappearance.