A rare World War II-era siren still survives in the southern suburbs of Manchester.

This castle resides in a valley known for immense bloodshed during the Middle Ages.

This classic red telephone box is now a community art installation celebrating local history.

Stonehenge has nothing on Castlerigg’s views.

This picturesque view of the Scottish Borders was beloved by Sir Walter Scott.

From fortification to folly, this hilltop structure has undergone many changes in the last 800 years.

The one-time stronghold of the noble Douglas family, now home to ghost sightings and nesting birds.

The National Railway Museum in York is the largest railway museum in the world, attracting almost 1 million visitors per year.

This network of narrow, medieval passages has the most delightful name.

This sculpture marks the spot where one of the greatest Roman rulers was proclaimed emperor.

This memorial to World War II's fallen airmen shows us the movements of the stars that once guided them.

Locals affectionately dubbed this World War I memorial "Tommy."

Public art now takes pride of place on the site of one of County Durham's last deep coal mines.

These 20-foot jaw bones honor a time when the leviathan bones were a sign that whalers survived the hunt.

Britain's tallest megalith towers over the cemetery of a quiet English village.

Dedicated to the 4th Baronet of Sledmere.

A fantastic example of Victorian railway engineering with two unusual decorative features.

This massive monument honors the first human in space.

World's largest bell sits on the grounds of the Kremlin in Moscow.

Inside the world's largest seed bank, WWII botanists elected to starve to death rather than compromise their collection.

The oldest museum in Russia is home to a fascinating collection of nearly two million anthropological artifacts and anatomical curiosities.

This effigy of Peter the Great is greatly disproportionate.

The ruins of a 12th-century seaside castle on the southwest coast of Scotland.

A circle made up of 19 boulders has stood in Scotland's Bladnoch Valley for some 4,000 years.