The cave of a 12th-century hermit is still visited and venerated today.

Even though some of the buildings date back to the Victorian era, this research institute is still involved in cutting-edge astronomy research.

Poet Antonio Machado's former residence offers the quintessential Castilian lifestyle of the provincial towns in the early 20th century.

A UNESCO-protected spiritual seat of the Old Serbian Kingdom and Empire.

This site commemorates the birthplace of the game of basketball, invented by James Naismith in the winter of 1891.

A 14th-century Serbian Orthodox church that was once converted into a mosque under the much-disfavored Ottoman Empire.

A 19th-century relic of timekeeping.

In this 400-year-old hotel in Madrid, you'll find a comb in every room, an old clock, and maybe a ghost.

These 100-year-old tunnels in downtown Provo house artists, restaurants, and a few surprises.

Local folklore claims that this wall was not built for defense, but to provide labor during a time of famine.

This 18th-century pond is one of the main attractions in the Jardín del Príncipe in Aranjuez.

A Beaux-Arts architectural surprise and a charming nostalgic tour through northern Mexico’s railway revolution.

On May 2, 1845, crowds gathered to watch a clown and four geese sail upstream in a bathtub. Then disaster struck.

In the heart of Luxembourg's "little Switzerland" weaves a breathtaking natural sandstone canyon with a mythological past.

These hilltop ruins of a forgotten Buddhist monastery flourished in Antiquity from trade with the Roman Empire.

One of the most notable figures in the Wurstelprater’s history is often assumed to be a fictional character.

It is believed that this Buddhist temple stands right on the gateway to the underworld.

This mill played a key role in the region’s development and it is just one of ten along the east coast of the United States.

Initially meant to immortalize the valor of the colonizer, this monument is now a symbol of Mauritanian resistance.

A metal skywalk leads to the top of this striking granite outcrop in Porongurup National Park.

How did a lighthouse wind up in the middle of this landlocked German city?

The monastery survived the Communist revolution in Mongolia as a religious museum.

These hooded graves are the only of their kind in the United States.

Most historians agree that the so-called "Gentleman Pirate" wasn't much of either of those things.