The colorful stairs are made with marble from the world's major quarries.

A roadway designed for a visiting monarch.

The heads of two giant mythological water horses honor Scotland's horselord past.

Old-fashioned knowledge and modern engineering create the world's only rotating boatlift.

A sculpture in a secluded garden honors one of Edinburgh's most innovative thinkers and city planners.

An artist's whimsical transformation of everyday objects.

The Scottish Reformation leader's grave was paved over and is now a parking lot.

Remnants of the 16th-century defensive wall still stand unassumingly within Edinburgh.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

Where condemned pirates met their grisly end at the gallows on the River Thames.

Sculptor Antony Gormley used chaos theory and fractal growth to design his tallest creation.

Baroque celebration of the end of the Great Plague of Vienna.

An early 20th-century bullring converted into a modern shopping center.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

A church filled with the bones of hundreds of virgins martyrs—or so they say.

A distinctive former power plant turned university lecture hall looks like it could make you breakfast.

The body of at least one victim of a construction accident was left behind in the collapsed pylon, buried under tons of concrete.

Residing along a busy thoroughfare, this sculpture urges passersby to consider the future.

This futuristic German television spire is actually the world's largest digital clock.

Twisted buildings adorn the banks of the Rhine river.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

Copenhagen's celebrated theme park and gardens.

Pre-Nazi swastikas adorn the sculpted pachyderms flanking this brewhouse portal.

Opulence and fantasy collide in this royal chair which is supposedly made with unicorn horns.