Named for a doctor who made a breakthrough in London’s cholera epidemic, this 1800s pub was also the site of a queer “kiss-in.”

A small but stubborn relic of Spain’s turbulent past hides in plain sight.

An iconic British fixture in an unconventional color.

One of Madrid's most beloved statues is of an anonymous citizen.

This natural rock formation has an anatomical aesthetic.

Now a museum, this was once a prison facility and a hospital for the “criminally insane.”

This 400-year-old tree is actually an immigrant from North America.

Though it may look like a Modernist cathedral, this structure was built to store massive quantities of grain during World War II.

This ancient rock shelter features cave art and is one of the most culturally important sites in the country.

One of the youngest volcanic eruption sites in Australia.

One of the world's largest tractors was built to replace camel caravans.

This classic photo booth was saved from destruction by the local community.

This enigmatic Iberian sculpture of uncertain origin may have once guarded a burial site.

Commemorating the 19th-century labor movement in Australia.

Equipped with thousands of LED lights, this geodesic dome-shaped stadium is an engineering delight.

A totally unique, animatronic depiction of the Australian gunslinger's last stand.

This abstract sculpture was initially so disliked that it got moved to the outskirts of town a few months after installation.

With a facade that measures just 107 centimeters, this five-story building is one of the skinniest in Europe.

The earliest known map to show America, discovered by accident at a Paris bookshop.

The ceiling of this shopping arcade is adorned with six trompe-l’œil artworks, including a grim funeral scene.

Shrapnel scars and bullet holes from the Spanish Civil War can still be seen in this monument to Spanish doctor Federico Rubio.

Inaugurated three times, this tower offers some of the best views of Madrid.

These three pillboxes still remain as a witness of the Spanish Civil War in a park of Madrid.

A rare set of strings by famed instrument maker Antonio Stradivarius is on display in the Royal Palace.