At almost 1,000 years old, this is the oldest known door in all of Britain.

The world's longest continuously running show has played at this small West End theater since 1974.

A memorial for public executions that dates back to the 14th century.

After 800 years, Europe's oldest elm tree has met its end.

A moving memorial to the fallen and missing from WWI trenches.

A rare example of World War I trenches from the British front.

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

In the days before house numbers, these colorful signs held clues about various buildings' purposes.

Amsterdam's former hotspot for public executions and dissections.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

Once designed as the entrance to Buckingham Palace, this structure was later relocated and stands as a victory arch.

From amidst her whirling waves, this mermaid sees all who pass through St. Swithun’s Church. If local legends are to be believed, she serves as a warning.

The world's smallest Austen museum is inside an unassuming phone booth.

In 1999, a new equine figure was cut into this English hillside near the site where an older white horse had previously appeared.

One of the smaller hillside chalk horses was designed and cut in by a group of local students in 1804.

This figure was cut into the hillside in 1937 to commemorate the coronation of King George VI.

Several Iron Age artifacts were discovered during excavations of this ancient site.

At the top of the hour, figures of the London department store's two co-founders emerge and bow to each other.

This rocky outcrop served as a quarry for some of the bluestones that sit at the center of Stonehenge.

Long before mobile phones or GPS were available, these sentry boxes provided help for motorists in need.

Since the Middle Ages, this stone has been used as a place to bless fishing boats moored at the nearby landing stage.

A wooden statue of a mermaid commemorates one fisherman's generosity.

A museum dedicated to Wales’ favorite—and strangest-looking—watercraft.

This cathedral's stained-glass patchwork of psychedelic colors and shapes was put in place long before the swinging 60s.