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

An abstract representation of weather in Sweden.

This stucco building in North Africa was the first American-owned property on foreign soil.

A beautiful little castle with a rich history now home to the Archives of the Spanish Air Force.

The 19th-century home of Count and Countess von Hallwyl is now a museum.

A historic castle that served as a backdrop to part of an elaborate extraterrestrial hoax.

This stone once marked the boundaries of Liverpool's medieval markets.

This Grade II Listed Building with an Art Nouveau façade once contained a unique print shop.

For decades, the parade of apostles that left the Expiatory Temple of Guadalajara remained hidden inside one of the towers.

This tiny alleyway is now a shrine to a subculture riot between the mods and rockers.

Built to power trains, the engines in this building provided the entire city of Madrid with electricity during the Spanish Civil War.

This Roman arena once played host to bloody gladiatorial battles.

This unique sculpture is often overlooked by pedestrians.

These abandoned country fairgrounds are filled with replicas of Spanish monuments.

A temporary art piece to celebrate LGBTQ Pride is now a permanent part of Stockholm's traffic landscape.

The first mechanized factory in Spain is also one of the most significant mints in the history of money.

An automaton perched above an classic clock and watch store

These "mermaids" that surround a plaza in Segovia are rather sphinx-like.

The fragmented remains of a massive public bath connected to the city's water supply.

An old, deep well, connected with a miraculous, divine rescue and the patron saint of Madrid.

The remains of this misplaced church were moved here stone by stone.

A pair of gigantic baby heads greet passengers at Atocha Station.

One of the most important Celtic-Roman archaeological sites in Spain.

One of the world's first dedicated bank buildings in the world is now the oldest one.