Amsterdam's narrowest house facade is a monument to 17th-century tax evasion.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

A poignant museum dedicated to the history of the Dutch resistance against Nazi occupation

One of the largest ochre quarries in the world, hidden in a limestone landscape.

This stone memorial commemorates a group of French patriots slain by French fascists.

This overlooked museum houses an amazing collection of rare, antique typewriters.

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

Hundreds of prehistoric stones, arranged in perfect lines in a French field.

A Parisian exterminator's shop whose storefront displays stuffed rats hanging from traps.

The celebrated eyesore created by starry-eyed sweethearts.

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

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

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

A lone cannonball remains lodged in the walls of the Hotel de Sens as a sober reminder of a revolution.

This modest marker near Notre Dame identifies the very center of Paris.

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

This 18th-century sundial was designed to calculate the date of Easter each year.

The video game-themed street art first popped up in the French city.

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

Site of a classic 19th-century physics experiment to prove the earth is rotating.

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

A Parisian cemetery where the elite and artistic are interred beneath an eccentric collection of tombs.

135 bronze medallions mark a French meridian line which once rivaled the hotshot Greenwich timeline.

The vast, legendary catacombs hold secrets much stranger than stacked bones.