These ominous lava formations were said to be an entrance to the netherworld so of course they inspired a famous metal band.

Buried five stories underground, this Soviet bunker is packed with gas masks and Cold War paraphernalia.

A walkable map of the world, made from soil and stone by one man.

This ancient Irish religious site is covered in ancient carvings, many of which have barely aged.

Free public park and gardens filled with peacocks and peahens.

Go inside to really appreciate this 500-year-old technological masterpiece.

Over 50 exquisite hand-painted Renaissance maps decorate a Medici storage room.

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

This small chapel is built of human bones and decorated with a golden skeleton.

Underneath this small church are 15,000 bones, arranged by an obsessive academic.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Hidden in a secluded Greek cove is a pristine beach marred only by the rusting smuggler's hulk stranded on its shores.

A bronze statue dating back as far as 1252, still has remnants of gold on its right cheek from ancient gilding.

Five candy-colored villages on the Italian Riviera.

An ultra-modern diversity park in Denmark has turned an entire city block electric pink.

A steampunk-styled three-floor factory churning out art, activism, and electronic beats.

An underground city of salt.

This modern monument to pagan belief looks like it was transported straight from ancient times.

Once a black market electronics marketplace, now an otaku shopper's paradise.

Roman ruins top white travertine terraces formed by ancient hot springs.

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

The unbelievably opulent home built for an infamous newspaperman.

An ordinary pond with fish from out of this world.