The largest Roman amphitheater in the Balkans once held over 20,000 people, but managed to lay hidden for hundreds of years.

A museum dedicated to secret surveillance.

A memorial to the atrocities of the People's Socialist Republic of Albania.

In the heart of Tirana, this underground nuclear bunker has been transformed into a museum.

Once the fallout shelter of a dictator, this sprawling bunker is now a combined history museum and contemporary art gallery.

This colorful statue welcomes visitors to a Barcelona park.

This cafe offers a curated collection of treats and tipples made by monks and nuns.

An unusual stroll through gentlemen's erotica demonstrates that pornography is timeless.

A cemetery in Barcelona's Poblenou district is home to this touching funerary statue, which depicts death in the form of a winged skeleton.

Feast on cuttlefish ink-stained paella by the beach.

Grab a slice of Catalonia’s famous flatbread in a space with ancient Roman roots.

This former Baroque palace on the historic Calle Montcada is a rare architectural gem and was once the meeting place of an aristocratic scholarly society.

This fountain was designed to honor the man who helped bring water to Barcelona.

The 2,000-year-old Roman columns are hidden within Barcelona's Gothic Quarter.

On the wall of this medieval walkway, a symbol of the Spanish Inquisition.

A bookstore dedicated to the intersection of comedy and art.

The largest Art Nouveau complex in the world is a Barcelona hospital with a 600-year-long history.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

Step inside the first house designed by Catalan architect Antoni Gaudí, considered to be one of the first Art Nouveau buildings.

Open since 1912, this restaurant is one of the few left that serves chicken with lobster and other Catalan-style surf and turf staples.

Tragedy on Little Brewster Island memorialized.

The tomb of Increase Mather and his son Cotton, influential colonial ministers obsessed with the occult.

This landmark cemetery in Boston was created more than 300 years ago.

This bronze sculpture was inspired by a photograph of Martin Luther King Jr. and his wife embracing after he won the Nobel Peace Prize.