A former reservoir that was only recently discovered after more than 60 years of disuse.

The highest pedestrian bridge in Singapore looks like a series of undulating waves rising between two public parks.

Singapore's oldest Hindu temple.

This house is one of the most colorful in the country, and is the last remaining example of a historic villa.

Colorful umbrella-covered trees in Singapore's Little India look straight out of Dr. Seuss.

A gorgeous gilded tower houses what may be the world's largest collection of gin.

Singapore's last surviving traditional village is hidden among giant skyscrapers and modern infrastructure.

The busy transport hub is home to the tallest airport slide in the world.

Colorful and chaotic stacked hotel in North Holland.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

The Bloemen Route, or “Flower Route”, stretches 25 miles through prime Dutch tulip country as a result of “tulip mania,” the world’s first economic bubble.

Birthplace of the "Cat in the Cradle" and a cluster of iconic, original windmills that let the Dutch tame the seas.

Peek through a transparent pyramid and drink in the mountain made of books.

The bridges portrayed on EU currency aren't fictional anymore.

A journey through 430 years of bulbiculture in the Netherlands.

19th century pendulum and a clock restored by a rogue group of guerilla artists.

The narrowest street in Paris.

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

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

An overlooked marble is the only surviving in-place 18th century example of the measurement that changed how we define distance.