Part modern art project, part traditional chapel, this see-through church is only substantial from the right angle.

World's largest permanent maze made of 18,000 conifers.

The "stairway to heaven" lookout tower was built to resist weather, arson, and the laws of physics.

A 14th-century fortified keep showcases the masterpieces of an ingenious 20th-century clockmaker.

A pilgrimage site where people ask Saint Dymphna to watch over those who are not of sound mind.

A fascinating and enormous collection of natural history exhibits stained by a dark colonial legacy.

A jazz band formed by African water animals in the heart of Flemish Brabant.

A wonderfully kitsch bookstore the size of a supermarket.

This Belgian palace was long the domain of priests and aristocrats but is now being turned into an art commune.

Drink among marionettes at this pub inside a historic puppet theater.

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

When you're a great Russian Tsar, even your vomit gets a statue.

This recently restored crypt was once plagued by liquefying coffins and exploding caskets.

This Greek temple, open only an hour a day, was the site of a war of tastes between an architect and an artist.

The Belgian royal family's private depot now stands abandoned and forgotten alongside the tracks.

Lavish royal estate punctuated with heated greenhouses.

Legend has it that this bronze orb, which sat atop an ancient Egyptian obelisk, once held the ashes of Julius Caesar.

Hidden within this iconic mountain are a set of World War II bunkers once used by German forces.

This is the oldest Roman-made bridge in the city still existing in its original state.

Roman politician Herodes Atticus built this nymphaeum to honor his wife, whom he may have murdered.

In the early Roman Empire, people deemed traitors and criminals were tossed to their deaths from this rock.

A forgotten "city of water" underneath the famous Trevi district.

This ancient market is often referred to as the oldest shopping mall in the world.

A magnificent waterfall is also home to the remains of a Roman hydraulic engineering system.