The sign at the garden gate reads: "These Plants Can Kill."

This iconic 1,000-year-old medieval castle is a favorite of the film industry, most notably as the location for Hogwarts in Harry Potter.

This beautiful example of Victorian engineering is the oldest water-balanced funicular anywhere in the world.

This strange moor has a song written about it, Bronze Age carvings, and an alien sighting.

Harry Potter once visited this massive limestone cliff, which was carved by an ancient glacial river.

Legends say this red sandstone monolith and the dozens of smaller boulders that surround it were once a coven of witches—before a Scottish wizard turned them all to stone.

Cold war icon and onetime "hole" in the iron curtain.

The last remnants of a massive medieval wall that once encompassed the city of Berlin.

Budapest's Communist-era statues, banished to the suburbs.

This quaint Hungarian railway system is operated exclusively by children between the ages of 10 and 14.

A two-way chairlift system between Zugliget and the highest point in the city.

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

A much-loved sculpture depicting the hero of a 1956 anti-Soviet uprising.

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

Some of the greatest minds in the history of Hungarian art and science converged in this café.

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

This easily overlooked memorial immortalizes the scars from the 1956 Hungarian Revolution.

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

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

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

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

Formerly Yugoslavia's "forbidden island," this sleepy little city still holds the abandoned remains of military strongholds.

During the heyday of fishing in Hastings, there were more than 100 of these storage facilities.

These stark white cliffs were spat up by the sea and are slowly being retaken by it.