A bike train runs along a disused railway line through the tranquil French countryside.

The birthplace of the ferocious William the Conqueror, this castle is awash in medieval history.

The Church of the Annunciation was carved into the face of a cliff, just like the rest of the town of Haute-Isle.

A 2017 crowdfunding campaign saved this historic castle from being destroyed.

The world's tallest bridge is also possibly the most elegant.

The post-apocalyptic remnants of a bucolic town ruined by a plane crash.

The 16th-century church was kept in its ruined state as a reminder of the casualties of World War I.

This ancient theater was once the home of fierce gladiatorial battles.

An ancient monastery, a locked room, and a mysterious book heist.

This French castle is said to have once held the Holy Grail but is now a gorgeous mountaintop ruin.

The world's largest reflecting pool is just two centimeters deep.

This stunning French estate was so lavish that it landed its original owner in jail for the rest of his life.

Beautiful carved tunnels.

These quaint French houses dangle precariously over a precipice.

A public park off the beaten path with a beautiful waterfall and 13th century Cistercian abbey.