Believed to be the remains of the lost Temple of Minerva, this nymphaeum has been known by its misnomer to this day.

This hermitage celebrates the legend of Emperor Constantine's healing from leprosy.

A sculpture serving as an homage to Pope John Paul II.

Inside this McDonald's you can dine on your Big Mac and fries next to a 2,500-year-old Roman wall.

Possibly the most beautiful carillon in the world, set atop Iron Mountain in Florida.

A forgotten sea village stands silent after hurricanes deemed it obsolete.

This Art Deco theater is the last remaining opera house in the “little Broadway of the North.”

The world's largest rotating world.

The historic Masonic Lodge in which the first-ever female Mason was initiated.

This narrow path was cut right into a French mountainside to feed the country's early naval expansion.

A colossal sculptural lion built by the same man who designed the Statue of Liberty.

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

An immersive projection art installation uses sound, scale, and light to take visitors inside classic works of art.

One of the oldest masonic museums in Paris.

Architect Le Corbusier built his friend a cubist house to match his impressive collection of cubist art.

An iconic and eccentric bar for "Manouche" Jazz music keeps expanding its space—and its influence.

This stunning natural double arch, the largest in the Alps, went undiscovered until 2005.

This off-limits room in the National Library of France is home to a system of pneumatic tubes, once used to bring books to readers.

This natural French spring has been turned into a magical grotto by Roman and medieval constructions.

A majestic lion statue guards this Parisian botanical garden, and feeds on an unsettling item.

A subterranean shelter remains intact under a busy Paris railway station.

A mechanized clock where a man fights off a dragon, crab, and rooster.

The world's longest and deepest train tunnel.

One of the highest emergency huts in the world has been waiting almost a century to give imperiled climbers a place to lie down.