England's most famous front door has an accidental doppelganger.

The canine-themed book collection claims to be Europe's largest dog library.

Where Aleister Crowley attempted to seize the Hermetic Order of the Golden Dawn in a mask and a kilt.

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.

The oldest active church in Pennsylvania is also the second oldest Swedish Church in the United States.

These medicine cabinet staples are part of the museum's collection of everyday objects.

Alexander Hamilton’s creation caused quite a bit of controversy.

The oldest of only three existing statues of the great novelist stands in a city he did not care for.

Hidden behind West Philadelphia rowhomes is a haven for migratory and local bird species both ordinary and rare.

The world's third-largest crystal sphere has sat in the Penn Museum since 1927 with the exception of one outlandish theft.

An Irish Memorial commemorating those who perished due to potato blight.

Ant sculptures march up the side of what used to be an iconic spot in punk rock lore.

In the early 1800s, surgery was also a show.

One artist's love letter to his city and its citizens plays out across dozens of bright murals painted on the sides of decrepit buildings.

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

These ancient artifacts are a testament to the enduring significance of the bull in Spanish culture.

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

Replicas of fossils unearthed during renovation work reveal how this area would have looked millions of years ago.

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

This enigmatic artifact is a rare depiction of an ancient Iberian noblewoman.

This postmodern apartment block was designed to be a vertical neighborhood.

A lush indoor jungle fills this bustling Madrid transportation hub.

The unfinished final resting place of some of Spain's most prominent politicians.

This Gothic church houses ornate royal tombs and a magnificent gilded altarpiece.