The official motto of Luxembourg reminds passersby of the Luxembourgish commitment to their national identity and sovereignty.

This small chapel built into rock is the oldest place of worship in Luxembourg.

This magenta statue commemorates the legendary marriage between a mermaid and the city's founder.

This mysterious anthropomorphic statuette is on display at the National Museum of Oman.

Along the pavement of this neighborhood in Madrid are quotes from famous authors.

This little sun pays homage to a massive gate that once stood at this location.

This historic Art Nouveau townhouse was the former home of the son of a famous chemical inventor and industrialist.

You can spot this teeny tiny stained-glass window from the Bonifacius bridge.

The spectacular and eerie moss-covered grave site of 19th-century Belgian merchant.

The tomb of one of the greatest travelers in history.

The ruins in this village were caused by something more sinister than neglect.

Dine on superb local staples in a converted historic church.

The cell which saved the life of Ludger Sylbaris, "the man who lived through Doomsday."

Drink the 'Blood of Christ' in this Roman Catholic fever dream.

An undeciphered text is inscribed on a mysterious stone slab.

A reproduction of the famous prehistoric cave paintings is hidden underground at the National Archaeological Museum.

One of Madrid's oldest trees, with a long and colorful history, resides in El Retiro Park.

Order cookies baked by cloistered nuns in a 400-year-old monastery.

The oldest building in Madrid.

One of the best examples of the modernist movement in Madrid.

Once a resting spot for King Fernando VII.

This modernist bridge highlights the bear as a symbol of Madrid.

This handsomely carved wooden church is more than 800 years old.

A temple to modernity, tucked away amid Barcelona's more well known museums.