This artificial lake was built to provide water for a planned facility that would treat tuberculosis patients.

Two beautiful Victorian-era parks replete with ornamental waterfalls and lakes.

A winding cave grotto walkway built to provide employment for veterans after World War I.

One of the few standing Roman lighthouses and a labyrinth of tunnels are a couple of the secrets at this historic castle.

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

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

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

The deepest spring in Missouri.

Often referred to as the largest spring in America.

A tribute to the local dog beach.

A spiralling hourglass-shaped tower rises from the forests in Denmark.

An unusual stroll through gentlemen's erotica demonstrates that pornography is timeless.

This wrecked airplane has been sitting on a black sand beach since the 1970s.

Take a leisurely walk through the park to find the seven giant troll sculptures hidden throughout the park.

A sublime medieval path adorns the marble floor of one of the most beautiful Gothic cathedrals in France.

This demon atop the Notre-Dame de Paris looks utterly bored.

Saintly bones pressed into a wax effigy of a Catholic superstar.

Tables of secondhand books fill the inner courtyard of this 17th-century stock exchange.

This statue honors the thousands of Allied avians that served and died for France during World War I.

An astounding collection of taxidermy, fossils, skeletons, and even a few strange live beasts.

A glacial pothole was once a hideout for a notorious Scottish outlaw.

From here, the loch appears to take the shape of mainland Scotland.

This abandoned mausoleum from 1815 sits deep within the forest surrounding Callendar House.

The medieval-looking hammer beam teak roof may be a Victorian vanity, but it's still absolutely magnificent.