This wondrous waterfall rushing down a green-covered mountain wasn't discovered until 2010.

These ancient sunken lanes were naturally tunneled into the soft ground by countless footsteps.

An authentic replica of an Asian temple and garden hidden amongst the natural beauty of Hawai'i.

This historic little railroad runs through some of the most beautiful scenery in Germany.

Enormous sandstone towers loom within a Czech forest.

French commune at the heart of conspiracies.

The opulent home that inspired Tintin's Marlinspike Hall and the adventures within.

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

These quaint French houses dangle precariously over a precipice.

One of the last umbrella repair shops in Paris upholds the nostalgic art of umbrella making.

Historic medieval fortified city in southwest France.

An icy lake tucked among jaw-dropping alpine panoramas.

This historic island prison holds one of the dungeons from the Count of Monte Cristo even though it is a work of fiction.

A 14th century bridge built as a fortress, where the devil lurks on one of its towers.

Ancient paintings known as the "Sistine Chapel of Cave Art."

One of the greatest maze designer’s greatest mazes.

Sacked by Vikings, blessed by William the Conqueror, dealt a fatal blow during the French Revolution—these ruins have seen it all.

France's national museum of scientific and industrial instruments.

A counter-culture bookstore like no other hides in plain sight in the streets of Paris.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

This picturesque mansion has gone from opulent ruin to nature museum.

This colorful artistic feature atop a Danish art gallery allows visitors to stroll through a rainbow.