An extraordinary house museum and cabinet of curiosities in the heart of Florence.

This spaceship sculpture in the middle of the Slovakian capital looks like it just crash-landed.

A once-fairy tale mansion now stands in a state of disrepair.

A line of disused military bunkers built to defend against Nazi invasion lies hidden on the outskirts of the city.

The place where World War I began.

Sealing couples' love since just after World War I.

This memorial park stands on the site of one of the largest mass executions of the Second World War.

This impressively complicated radioastronomy research center was once a tool of Soviet spies.

These abandoned vessels are destined to be reclaimed by the forest.

Built to ward off Napoleon's army, this city-sized abandoned Russian fort is now perfect for urban exploration.

Spend the night in 1920s Latvia in this historic recreation and movie set.

These crumbling Latvian forts make for some haunting seaside ruins.

The statue of a legendary giant who carried Christ and shouldered the world's sins.

This enigmatic artifact remained buried in a churchyard for years.

A vast and unlikely aviation museum kept alive for over 50 years due to one man's tenacity.

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

A preserved oak tree about 3,500 years old found in Riga, Latvia.

Medical museum that houses most notably the taxidermied remains of Vladimir Demikhov's famous two-headed dog experiment.

A former Latvian headquarters of the brutal KGB secret police is now open as a grim reminder of their atrocities.

On the outskirts of a desert trading village high on the Andean plain, steel giants have been destroyed by salt winds.

This 11th-century structure is one of the oldest churches in Romania.

Climbing to the top of the cathedral's bell tower offers sweeping views of these medieval ruins.

This Croatian fairytale castle is slowly falling apart thanks to years of neglect.

Longest fortress system anywhere in Europe.