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

A relic of World War I that now exist as a piece of public art.

In the fictional world of Kcymaerxthaere, standing at this site just outside Vienna, Austria, the sky would have been found beneath your feet.

Collection dedicated to funeral rites, equipment, and mourning rituals of the Viennese.

A neo-Gothic mansion now houses a wunderkammer of analog tech that hits on all the senses.

A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.

Inside the corridors of this flea market, visitors are sure to find some obscure and odd treasures.

One of the best collections of wax anatomical models in the world.

Vienna's underworld of tunnels and subterranean rivers made an iconic appearance in a 1949 Orson Welles film.

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

Now abandoned, the world's first torpedo factory is crumbling into the sea.

When Croatia became independent of Yugoslavia, the splintering governments left behind these concrete tunnels.

The now-overgrown beach resort was once frequented by Yugoslav military elite.

This Croatian fairytale castle is slowly falling apart thanks to years of neglect.

This picturesque medieval monastery guards a small trove of historic treasures.

This truly palatial work of Communist-era architecture now sits crumbling on a Croatian beach.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

Large, airy hallways hide within an impenetrable fortress that beckons urban explorers.

A musical instrument played by the sea.

An ethereal glowing blue ocean cave in Croatia.

This only museum in the world dedicated solely to mushrooms.

An eclectic art form practiced by untrained masters is celebrated at this museum in the heart of Zagreb's old Upper Town.

This former estate of a fascist leader is now a burnt out ruin leading to a system of secret tunnels.

This Hungarian stilt village is built in a lake that never freezes over due to the power plant that that uses it as a cooling pond.