Baroque celebration of the end of the Great Plague of Vienna.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

The final resting place for the remains of 143 Habsburg royalty.

A patriotic medieval knight in driven-nail armor raised money for widows and orphans of WWI.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.

One of the best collections of wax anatomical models in the world.

Apartment complexes built into huge repurposed natural gas tanks.

An abandoned water sports stadium that has become a haven for graffiti and decay.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

Overlooking the Colorado Convention Center is this giant sculpture made from thousands of triangles.

This cathedral dedicated to Louis IX, sainted King of France, holds many secrets.

The floating gallery illuminates the heart of Québec City's arts district.

Fuel your honky-tonking with this venue's unbeatable “Recession Special.”

A contemporary fresco movement illustrates the region's rich history.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

This steep cable railway has been hoisting passengers in the heart of Québec City for over a century.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

A pair of club-wielding guardians stand watch over London's first public clock to feature a minute hand.

A haunting monument dedicated to the Royal Naval Air Service and the Fleet Air Arm.

A statue of the original Pearly King is hidden in a church's crypt.

This intriguing Bronze Age artifact spent centuries hidden within a Welsh faerie hill.

The ruins of a church destroyed by both the Great Fire of London and the Blitz, now turned into a peaceful garden.

This ancient Egyptian obelisk still bears the wounds of World War I.