Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

This 18th-century sundial was designed to calculate the date of Easter each year.

One of the oldest medical collections in Europe focusing on rare surgical instruments.

A cave network located at the southernmost tip of mainland Greece was once believed to be an entrance to Hades.

This abandoned Belgian fortress is purposefully being left to nature.

A once-magnificent collegiate church is falling into ruin.

This ghost town in Belgium will lose its street art when it ceases to exist.

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

A collection of weird and wonderful art fills a former houseplant nursery.

One of Belgium's oldest hospitals saw patients from the 13th to 20th centuries before becoming a museum.

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

Rare wooden escalators lead deep down into an otherwise staggeringly monotonous tiled tunnel.

An open-air sewer system that was covered piece-by-piece over 300 years.

This impressive collection of skulls and bones was gathered by an ex-zookeeper who took advantage of a pig plague.

Head underground and take a tour of the city's working sewer system, and see the underground river Senne, which defined Brussels for centuries before being covered in the 19th century.

This modern arts center is built around a gem of late-Baroque architecture.

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

This non-profit theatre in the heart of Brussels is dedicated to hosting independent films.

The vast chamber inside this abandoned cooling tower looks like something out of a sci-fi dystopia.

Medical history with an amazing, if frighting, collection of wax diseases on display.

A magical and peaceful ruined Cistercian abbey in what is now southern Belgium.

A Turkish monastery tucked into a cliff wall.

Ottoman-era houses lovingly preserved.

Naturally protected city carved from a rock face.