Some 80,000 Delft Blue tiles line the inside of this Amsterdam walkway.

This large copper bolt represents the benchmark for measuring sea levels in most of Europe.

This unattributed sculpture in Amsterdam is hiding in plain sight.

A set of seven houses, each built in a style that represents a European country.

A public urinal so pretty, it was declared a national monument.

This cheese shop also houses a museum devoted to Dutch dairy.

A natural spring situated on the grounds of the Hawthorne estate.

The Grand Ole Opry's big voice came from a small home in rural Virginia where she was eventually buried.

Little has changed in the way that this mill operates since the 18th-century.

An eponymous directional signpost erected by the first president of the United States.

Every autumn, this grove of living fossils erupts in a blaze of brilliant golden-yellow leaves and stinky fruit.

Crumbled shell of one of the oldest buildings in Virginia.

These buildings are a poignant reminder of the thousands of horses and mules who passed through this area of the Shenandoah Valley on their way to war.

This vast masterpiece of Moroccan architecture spreads across 20 acres.

A statue honoring a preeminent 19th-century dandy and important figure of men’s fashion.

An oddity of a bygone era that stills functions today.

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

The ground on which Shakespeare’s initial playhouse once stood.

Tucked away in a London Tube station, this 1920s linear clock shows the time across the world all at once.

The lab where the scientist made his groundbreaking discoveries is preserved on the basement floor of the Faraday Museum.

Heralded as the oldest statue in London.

A plaque marks the underground site of one of London's "lost rivers."

A "haunted" landmark on the coast of Southern California.

The sun acts as a key that only fits this giant keyhole twice a year.