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

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

This building has survived for more than a century and remains virtually untouched.

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

Time stands still at this serene burial ground in the center of Budapest.

A fake Transylvanian castle houses a cathedral of antlers.

This hidden art nouveau gem was designed by an architect in search of a national style.

A museum in the childhood house of a medical pioneer.

The romantic garden was the epicenter of the Hungarian art scene in the 1880s.

A Trabant car, a kangaroo statue, and a plethora of plants take over this abandoned-factory-turned-bar.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

Once the home of a hermetic monk, this cave now houses a small church.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

It's believed that this small church was connected to the Hagia Sophia via a secret tunnel.

Have tea in a cemetery with a dazzling view of Istanbul.

This historic hotel preserves many treasures from its heyday hosting passengers on the Orient Express.

Climb a set of vertiginous stone steps to the top of this impressive ancient edifice.

This former Imperial summer home was the venue for a royal slap that once echoed 'round the world.

One of the largest wooden constructions in Europe was meant to be a casino, but soon became an orphanage.

No one is sure if the world's fourth-largest diamond had been found in a rubbish heap or was pawned by Napoleon's mom.

The most metal church of all time was built in record time because of an international, pious pissing contest.

An Art Nouveau gem hides beneath the layers of city grime obscuring this once-magnificent building.

A sixth-century Byzantine cistern hidden below a modern carpet store.