Chelsea's soldiers were given strict orders when crossing this historic bridge.

This 13th century Gothic brick castle is the largest in the world by surface area.

This museum is dedicated solely to this millennia-old handheld cooling device.

The Great Fire of London and the regulation of one-way streets both started in this alley.

In northeastern Poland, the ruins of a massive granary overlook the Narew River.

A floundering Polish shipyard was once the soul of the Solidarity movement that capsized communism.

The first geometric self-supporting spiral stairs in Britain are a truly beautiful sight.

Warsaw's fantastically preserved gasworks...almost.

Berliners converted a bombed-out, disused lot into a community-run urban farm with its own cafe and bar.

This open-air heritage museum illuminates centuries of historic English life from a West Sussex village.

Brought to you by the makers of fiberglass dinosaurs.

The pockmarks across the building's facade are remnants of the Blitz.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

A mysterious shape catches the eye in this 16th-century painting.

The only pub in the world surrounded by an ancient stone circle.

The commemorative stone column conceals a secret laboratory.

Legend says these colorful, invasive residents are the descendants of birds released by Jimi Hendrix.

Tucked inside a South Bank bar is an epic expressionist chronicle of the 20th century.

An architectural oddity hides in plain sight on this iconic London bridge.

A tribute to the intrepid explorer and his crew who perished in terrible conditions on an ill-fated expedition to the Arctic.

The Tudor-style cottage in the middle of the square is not quite what it seems.

One of the figures in this Celtic sculpture continues to puzzle archaeologists.

The gigantic skull of a long-extinct species that once roamed the forests of England and Ireland.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.