Christ's blood allegedly preserved in a Belgian town.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

A fantastical 13th-century fortification sandwiched by a modern hotel in central Brussels.

Climb inside an iron crystal magnified 165 billion times its normal size.

Meet the bronze beloved pet to a family of famous peeing statues.

Brussels' favorite peeing boy has a sister.

Cozy basement bar sports an inventory of over 2,000 beers.

A little sculpture with a large wardrobe.

The silly symbol for an underground protest group is now scattered around the city.

A decommissioned submarine base makes a great space for graffiti art.

This behemoth bovine guards an Estonian town and is a memorial to the lost species.

A statue of the Soviet leader still stands in a quiet corner of Estonia’s most Russian city.

This Soviet-era "closed town" was a top secret uranium producer often left off of maps.

This stunning limestone waterfall is the highest in Estonia.

Man-made mineral caves house massive bat colony.

A trio of giant wooden megaphones turn up nature's volume in this Estonian forest.

This Estonian watchtower looks like a big tree with two giant bird nests on it, complete with a "golden egg."

For the last century, this international border within a small town has appeared and disappeared various times.

This former Nazi labor camp is now a poignant memorial, complete with giant Soviet-style monuments.

Built to ward off Napoleon's army, this city-sized abandoned Russian fort is now perfect for urban exploration.

This Latvian shot factory is still used twice a year to manufacture bullets the old-fashioned way.

How this choice of tombstone came to be is still a mystery.