This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

This former Nazi castle was built as a school to train what would have been the future of the Third Reich.

This Netherlands museum holds a gloriously mechanical collection of ornate musical automata.

Nicolas Schöffer's massive interactive sculpture was assembled in 1961 and brought back online in 2016.

The world's largest bicycle shelter can hold more than 12,500 two-wheelers.

This half-forgotten fortress was constructed by the Ottoman conqueror of Constantinople.

This black sand beach was crafted from volcanic explosions including the historic Minoan eruption.

This massive underground salt mine now holds a sci-fi theme park in its depths.

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

Even drowned in an ocean of toxic waste, the remnants of this Romanian village stand tall.

This bone-filled cave got its name after they found 140 bear skeletons inside.

A monastery considered a state-protected cultural monument of exceptional importance, founded in the 14th century by Serbian King Stefan Dečanski.

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

Hungarian Jews were ghettoized during the Second World War, but little remains of the original wall that closed the Jewish people off from the rest of the city.

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

A bronze woman in a stylized dress honors a courageous politician.

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

The holes in this wall provide a glimpse into Jewish life in Budapest, both past and present.

How did an Australian statue of the Bard of Avon end up in the Hungarian capital?

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

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

A diminutive statue that was inspired by the sculptor's own daughter.

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

A random tree outside a Budapest hotel has become a DIY shrine to the late singer.