The world’s oldest and biggest bookstore stocking only mystery, crime fiction, espionage, and thrillers.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

A semi-scholarly approach to sex.

The largest greenhouse in the world is home to over one million types of plants.

The ruins of this gorgeous clifftop castle look like something from a fantasy novel.

A unique waterfall that some believe attracts the fairfolk.

An Oxford museum where visitors can have tea with the Mad Hatter and climb through the wardrobe to a fantasy land.

400-year-old garden, restored to beauty.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

Elevated freight railway turned wildly successful urban park.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

Dodge prohibitionists and slide through the telephone booth in Crif Dogs.

Tucked in the back of this amazing antique store is an important piece of medical history.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

A terrific purveyor of natural history objects and curios.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

This wildly-tiled artist's palace is a living and growing account of the creator's life, loves, and labors.

The largest of London's subterranean rivers and once a mad, bad center of London life.

The fountain marks the area where hundreds of accused witches were burned at the stake.

The gloomy ruins that inspired Bram Stoker to bring Dracula to life.

This tangled English forest looks like something right out of a fairytale.

A fantastic castle rumored to be the birthplace of King Arthur.