Destroyed Serbian army headquarters sits half crumbled in a largely revitalized Belgrade.

A Serbian church lit by chandeliers made of weapons.

A towering spire in the fortress of Kalemegdan honors the victorious armies of Serbia during their struggles against the Ottoman Empire.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Steadily reminding Czechia of its past.

Throughout this shopping mall are medieval ruins that were discovered during the mall's construction.

Macabre astrological automaton clock dating to the late 1400s.

A mocking tribute to the past and modern leadership of Prague.

Ancient rock-hewn town that witnessed key events of Georgian history.

These Stalin-era industrial 'death traps' hang lifeless above the city

Small church on top of a huge rock column.

Rock-hewn monastery complex with hundreds of cave structures tucked away into the mountainside.

Underground monastery and fortress.

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

The house that took a plunge into the facade of a museum.

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

The former private quarters and office of Dr. Sigmund Freud now hosts a museum housing the works of the founding father of psychoanalysis.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

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

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

The Habsburgs' royal collections of art and wonders.

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

Museum devoted to the artificial language of Esperanto.