The tallest hotel in Europe.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

Moscow's imposing monument to the Space Age.

An iconic Soviet statue of working-class people.

Museum celebrating the achievements of the Soviet space program.

This newly renovated Soviet-era outdoor exhibition center is bigger than the principality of Monaco.

Over the centuries, this island paradise has done it all, from providing monks with ecclesiastical respite to sheltering an exiled Leon Trotsky.

A fountain standing as a testament to a doomed alliance.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

Ancient serpentine sacrifice holder that has stood the test of time.

A marvel of Byzantine engineering under the streets of Istanbul.

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

A gorgeous, Gaudí-esque stairway constructed in the city of Istanbul by a prominent Jewish family.

The former Nazi Germany concentration camp stands as a museum to remember this dark chapter in European history.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

Real bones which are said to have belonged to a Polish dragon.

A forgotten graveyard lost in the tangles of an overgrown garden.

On Gellért Hill, this statue depicts the tragic tale of lovers divided by the Danube.

This memorial to a murdered empress took 20 years to design, then spent 30 years hidden away in storage.

The geographical center of Budapest is marked with a 10-foot-tall stylized zero.

Also known as Uncle Karl, the beloved bronze copper keeps a watchful eye on St. Stephen’s Basilica while people rub his lucky belly.

The metal leaves on this tree are engraved with the names of Holocaust victims.

A stunning Art Nouveau cinema in the heart of Budapest.