The Victorian-era greenhouse is stuffed with tropical plants, and open 365 days a year.

A botanically themed auditorium blooms within the world’s last operating double-decker theater.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

A fortified palace in the shape of a ship on the Thiou river.

This renovated Art Nouveau bathroom from 1905 is worth the price of admission.

Montmartre's sole surviving windmill became an iconic landmark for 19th-century painters, artists, and bohemians.

If you look closely at the oldest bridge in Paris, you might notice hundreds of ugly faces leering from its sides.

One of Jeff Koons’s largest sculptures and his first commemorative work.

The approximate spot where the last Grand Master of the Knights Templar was put to death.

There has been an astronomical clock on this spot since the 14th century.

Dedicated to the art of hunting, with juxtapositions of contemporary art.

A well-preserved medieval village nested on a rocky outcrop and surrounded by a network of cliffs, natural bridges and canyons.

Order a boozy baba au rhum at the oldest patisserie in Paris.

Historic medieval fortified city in southwest France.

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

The narrowest street in Paris.

Once a 19th-century brasserie, this McDonald's exterior celebrates Alsatian design and the "King of Beer."

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

France's national museum of scientific and industrial instruments.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the 20th century.

A museum of carnival attractions where you are invited to ride the rides.

Former hunting lodge of a duke who was an avid collector of impressionist works.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.