One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

Madrid's romantically ornate crystal palace has been offering shelter to plants and art for over a century.

An ancient Egyptian temple in the middle of Madrid, Spain.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

A small house in Tazones, completely covered in shells.

This dockworkers' lunch joint has been left leaning by a century of storm floods.

This monument to those fallen in the World Wars is accompanied by a U-boat that Germany bought for a Deutsche Mark.

Hamburgers are intensely proud of their tunnel beneath the river.

Remnants of an exploded schooner and wrecked submarines form a breakwater.

This incredible stone temple is a monument to death, victory, and fantasy architecture.

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

Where commuters walk through remnants of an ancient Greek necropolis.

Tiny communists hammer away on the Olomouc Astronomical Clock.

An ornate plague column – built to celebrate life – claimed the lives of numerous artisans during its construction.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

An enormous and lavish Gothic church in Czechia.

Commonly acknowledged as the only public monument to the Devil himself.

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

A church of bones, decorated with 40,000 human skeletons.

Tucked away in a Prague park, a statue beloved by romantics honors a poet so nice they buried him twice.

The oldest garden in Prague, once part of an medieval orchard.