One of few vertical lava tubes in the world accessible by foot.

As the highest point in the Mid-Atlantic range this stratovolcano offers spectacular views.

A vast Communist-era exhibition space in the Bulgarian capital.

"Holy Wisdom" overlooks the city that became its namesake.

Sofia's legislative center is continuously reinventing itself.

A Bulgarian monument to Russia's role in World War II is constantly being painted in pop culture protest.

Underneath this Byzantinian church lies a necropolis filled with ancient tombs and the ruins of previous churches.

A striking symbol of the Bulgarian capital.

A collection of art from Bulgaria's time as a communist state.

This historic black and white monastery is one of Bulgaria's architectural jewels.

The smaller of the three towers of San Marino is a former prison inaccessible from the ground level.

High in the clouds of San Marino sits an ancient tower with some curious prisoner graffiti.

Where members of the Crossbow Corps of San Marino demonstrate their skills.

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

Dedicated to a synagogue that was destroyed after having survived World War II.

Also known as the Blue Church, the building was consecrated to the daughter of Andrew II.

No one knows the origin of this creepy little stone man with an oversized phallus.

Often mistaken as a medieval Gothic monument, this unique cornerstone only dates back to the 1980s.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

A sculpture of a beloved local figure, who tipped his top hat to everyone he passed on the streets of Bratislava.

An ode to a soldier who came to town, fell in love, then began making his own sparkling wine.

Brass plaques embedded in pavement preserve the memories of those who lost their lives at the hands of Nazis during World War II.

Launched by Napoleon's soldiers more than 200 years ago, a cannonball remains embedded in the tower wall.

In an area known in Bratislava’s postal history, this sculpture sits equipped with a functional postbox.