The largest ice cave in the world is thought to be the entrance to hell according to Austrian legend.

Trick water gardens from 1619 featuring a 200 piece mechanical theater powered by water.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

A church of bones, decorated with 40,000 human skeletons.

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

A Hungarian optometrist's charming collection of Asian art and curiosities.

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

A fake Transylvanian castle houses a cathedral of antlers.

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

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

Hungarian self-built castle.

The remains of an entire Roman city can be explored in this interactive museum.

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

An unusual round church in London with a Templar past.