An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

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

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

A floating cat sanctuary on an Amsterdam canal.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

The world's only museum devoted to the wonders of fluorescence.

Willy Wonka would love this weird half-a-home.

Smallest house in Toronto sits on a lot meant to be just wide enough for cars to drive through.

This colorful creation wasn't always a welcome part of Toronto's Moccasin Trail Park.

This Toronto garden collects stares and tchotchkes in equal measure.

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

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

One of Canada's most incredible rare book collections holds hundreds of thousands of gorgeous tomes that the general public can touch.

A book collector's dream, this Toronto bookstore has the world's first "Biblio-Mat," a random book vending machine.

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

This head-spinningly bizarre Depression-era art cave is wall-to-wall quartz and Jesus.

Home to Hollywood history and a very special salt crystal.

A landscape of massive spherical boulders are the main attraction in this Kansas State Park.

A mysterious and terrifying public art goblin seemingly meant to inspire local legend.

The grandson of a Kiowa chief created what has become the iconic symbol of a city on the Plains.

The first "Hut" was actually a small brick building.

Created by Catalan artist Joan Miró in 1978 and made up of 350,000 tiles, this mural is the only large-scale glass mosaic the artist ever created.

Named for the 39 tribes that live in Oklahoma, this restaurant's menu deliciously highlights local flavors.