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

This steam locomotive served as both an interesting static display and unique playground equipment since 1959.

A replica of the gaslit streetlamp under which three teenagers founded a football club.

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

The ruins of a sixth-century monastery sit on the banks of the River Shannon.

Metal horses galloping through a London fountain provide a link to the city's past.

This remote Scottish island has the only round church in the nation.

This old-world mansion with lush gardens is a gem in the heart of Silicon Valley.

A classically inspired temple in Redwood City.

This massive redwood tree has stood in Northern California for nearly 2,000 years.

This figure was cut into the hillside in 1937 to commemorate the coronation of King George VI.

Topeka has its own great wall, and it's covered in colorful images from the city's history.

This local mascot has been a presence in the area since the 1960s.

This cannonball embedded in the side of an Edinburgh house once served a surprisingly pedestrian purpose.

Heralded as the oldest statue in London.

A Kansas nature preserve protecting the plants and animals that once stretched across central North America.

A functioning Roman-era aqueduct and bridge in rural southwest France.

The way that light hits a stained glass window on a specific day is one of many "clues" to a mysterious treasure.

You can find America's highest suspension footbridge at Grandfather Mountain in North Carolina.

It's believed a castle existed at this site since the 12th century.

This elevator was built in 1907 to connect two neighborhoods separated by a steep, rocky cliff.

After serving in World War II and picking up Apollo astronauts, this aircraft carrier has been turned into a museum overlooking the San Francisco Bay.

A collection of vehicles across American military history.

A glass display case holds the document that ended the Second World War—which one person signed on the wrong line.