The ruins of the first Spanish settlement in Puerto Rico.

Nicknamed "Karri Knight," this Eucalyptus was planted in 1895 and stands at 72 meters.

An 11th-century medieval castle cascades over the town of Numão.

The world’s largest Masonic temple was saved by the White Stripes.

Enormous small-business mecca in the Midwest, serving dozens of artists.

The Beaux-Arts aquarium boasts a vast collection of saltwater and freshwater fish on an island in the Detroit River.

Detroit’s Eastern Market has been transformed into an outdoor museum with colorful murals that address social issues and symbolize the city.

This Detroit ruin was once a gothic bastion of its community, but now it stands as a haunting ruin.

These steps offer a breathtaking view of one of Europe's most besieged fortresses.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

The fountain marks the area where hundreds of accused witches were burned at the stake.

The building where Mary, Queen of Scots was said to have bathed in white wine.

The dance of this huge clock is a magnificent and eerie commentary on good and evil in the history of humankind.

This Scottish graveyard is the final resting place of the man who inspired the character Ebenezer Scrooge.

A sweet symbol marks the place where torturous executions were once carried out.

The most loyal of little dogs, or a Victorian era publicity stunt?

This alley off Edinburgh's Royal Mile contains remnants of the city's seedier history.

A roadway designed for a visiting monarch.

A verdant 17th-century-style garden hidden along Edinburgh’s Royal Mile.

Now home to a drinking establishment, this building has a macabre history.

This otherwise ordinary close on the Royal Mile constituted the end of the world for Edinburgh’s poorest residents.

This sculpture of disembodied body parts forms a poignant memory of the horrors of World War II.

This obscure walkway links Edinburgh’s Old Town with one of the city's prime vantage points.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.