Founded as a refugee camp, now a popular tourist spot.

The widest waterfall in Europe is a natural wonder and one of the only places where fish are caught in the air.

The only things left in this abandoned Latvian graveyard are a mysterious stone and a ghost story.

This former Imperial summer home was the venue for a royal slap that once echoed 'round the world.

Seven early Christians were sealed into a cave where legend has it they slept unharmed for centuries.

The alleged house of the Virgin Mary is tucked away in a park and nature preserve on Mt. Koressos in Turkey and is holy to both Catholics and Muslims alike.

The largest Neolithic ruins in the world hide a notably clean prehistoric metropolis.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

This famous city eluded concrete detection until the early 2000's.

A marvel of Byzantine engineering under the streets of Istanbul.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

This celebration of Latvia’s freedom and independence avoided demolition over half a century of Soviet occupation.

Latvia's symbolic mountain-shaped national library is home to millions of cultural tomes.

A black cat protests the City Guild in Riga's Old Town.

Flamboyant architecture from the turn of 20th century.

The oldest housing complex in Riga is a mini timeline of architectural trends.

A remnant of the original World Trade Center complex continues to serve as a commuter gateway.

Pulled from the rubble of one of the worst modern tragedies, a steel crossbeam became a symbol of hope for New Yorkers.

Gladiators battle and chariots race daily in the ruins of a once-great Roman city.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

Historic funicular railway, believed to be the shortest railroad in the world.

The legendary building that needed ghostly approval before being built.

A Mayan village preserved for centuries in volcanic ash.

This fortress in Honduras was built to resist pirates, but its builders had more to fear from the British.