An elaborate Romanesque archway, built right before the British occupation of Ireland.

A mysterious Neolithic tomb is perched along the edge of a modern golf course.

A hugely vast Irish landscape of barren rock that stretches for miles.

This Bronze Age tomb is the centerpiece of a clearing within a beautiful Irish forest.

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.

A nun spent 16 years painting the stunning Celtic mural that covers the interior of this WWI memorial.

Lavish royal estate punctuated with heated greenhouses.

A museum dedicated Germany's favorite drink and most well-known festival.

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

Nature is slowly overtaking this disused cemetery on the outskirts of Brussels.

One of the oldest bank museums in Europe showcases unusual currencies of the world and other money-related miscellanea.

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.

An ancient holy well said to be used by the patron saint of sailors and travelers, lost in the boggy west of Valentia Island.

On the Irish coast, 18 members of the Howard family are eternally resting in an Egyptian pyramid.

A devastating booze inferno poured through the streets, claiming several victims who drank it.

The ruins of a medieval monastery named after a type of tree.

The Grand Lodge of Ireland is one of the oldest in the world, full of fantastical, elaborately themed rooms.

This large, circular tomb is the final resting place of the first emperor of Rome.

Richard Luke Concanen never set foot on American soil.

This monumental fountain has moved around the city multiple times.

The burial place of an obscure North African saint was turned into a macabre body preservation factory for the 17th-century Neapolitan elite.

Skulls from the plague of 1656 and World War II bombings are united by a cult dedicated to caring for the ancient dead.

Mary Kelly was last seen here before she was murdered by Jack the Ripper.

Artists and musicians now rule over this former rail station.