A historic steam train meanders along one of the most scenic rail routes in Germany's Black Forest.

This charming, narrow-gauge railway in the Thames Estuary is sometimes referred to as the "Train to Nowhere."

The largest crypt ever constructed in France was built in the 11th century on an ancient Druid sacred site.

A once drab public housing estate is transformed into a colorful gallery of trompe l’oeil murals.

A small museum of antique transport that's a must-see for bicycle lovers.

A tiled, multi-level garden of survival in Lyon.

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

Straight out of a nightmare, barcode-faced babies climb up and down Prague's television tower.

The storefront of a ramshackle Parisian puppet theater.

A medieval church with largest and oldest collection of Renaissance frescoes in France.

A French artist's vague warning hangs over Belleville.

An unusual number plate signifies the building's saucy past.

An abandoned beach resort in Normandy reclaimed by artists.

The Sun King's military models, saved from the Louvre.

A chapel on a volcanic core, marking the end of a successful journey.

A self-built mosaic house and sculpture park.

A museum which takes visitors to the côté obscure of Paris.

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

Hundreds of secret cabinets built into the walls of legendary poisoner's private work room.

One woman's decades-long obsession with the "La Fée Verte."

Museum in a swimming pool where the water still flows.

The artist and his brother are buried in a landscape straight out of a van Gogh painting.

The oldest and smallest cemetery in Paris is only open to the public twice a year.

The spiral staircase hidden inside this giant Parisian column was likely built for Catherine de Medici's astrologer.