One of the earliest large-scale "hyper" roofs in the U.K. is now a derelict roadside attraction.

The oldest of the three remaining bridges in England with buildings on top of them.

A 15th-century former coaching inn forms the implausibly grand entrance to a 1980s shopping mall.

The Birthplace of the Englishman who founded the A.C. Milan football club.

Dozens of feral felines rule a segment of Hollywood's only graveyard.

It appears as if a man is standing behind this giant airport clock, painting the hands in real time.

The world's largest bicycle shelter can hold more than 12,500 two-wheelers.

Atop this former dutch railway office sits an interstellar work of art.

'The Letters of Utrecht' lays out a ribbon of poetry one letter at a time, with no final verse in sight.

This still-celebrated home was a radical architectural experiment in 3D De Stijl.

A historic observatory now an astronomy museum beautifully situated at the moat of the Middle Age city centre.

This Netherlands museum holds a gloriously mechanical collection of ornate musical automata.

These upturned herring boats make nifty storage sheds for fishing goods.

Journey through this open museum where even employees remain true to period.

Amsterdam's narrowest house facade is a monument to 17th-century tax evasion.

This 11th-century castle sits so low you can't see it behind the surrounding buildings.

One of the Leiden's oldest pubs is also the birthplace of the Heineken star.

A trio of red, white, and blue stones embedded in the streets of Leiden are markers of medieval territory and law.

The works of poetry's biggest names grace the walls of the city of Leiden, all carefully painted by hand.

Science meets wall art to highlight the beauty of famous mathematical equations.

Europe's official "zero-level," the equator of elevation.

The location of the world's first telescope demonstration.

Lumps of significant stone from around the world surround a flaming monument for peace.

A preserved building where the dead were once watched for signs of life.