A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

A triumphant marble and bronze fountain depicting a 15th-century Hungarian king and his hunting party.

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

Tucked away near more famous landmarks lies a statue meant to symbolize the confluence and continuing development of human culture.

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

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

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

A plaque bearing the names of those who dedicated themselves to protecting Budapest's Jewish population during World War II.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

The mummified right fist of a 1,000-year-old saint-king sits inside an ornate golden reliquary.

Museum dedicated to the terror regimes of Hungary.

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

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

The last of nine massive kilns that produced many of the red bricks for buildings in Washington, D.C. and northern Virginia in the early 20th century.

The first national memorial to honor all women suffragists stands on land where suffragists were once imprisoned.

This tower was once used to create ammunition for early settlers.

Ugly 18th-century dwarf statues living in a perfectly landscaped Austrian garden.

This skeleton-filled altar piece served as a backdrop to one of the most iconic scenes in "The Sound of Music."

Dress up like a miner and take a slide into the disco-lit depths of this once foundational salt mine.

Launched by Napoleon's soldiers more than 200 years ago, a cannonball remains embedded in the tower wall.

A sculpture of a beloved local figure, who tipped his top hat to everyone he passed on the streets of Bratislava.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

Dedicated to a synagogue that was destroyed after having survived World War II.