Bizarre dirt trail winds a narrow path above the tree line.

Eat like a bird in a bamboo nest.

Thailand's distressed elephants find peace at this Chiang Mai sanctuary.

At the right time of day, sunlight floods through the roof of this cave and illuminates the small pavilion hidden within.

A limestone wonderland of water and subterranean secrets.

This unusual elevator doesn’t stop or slow down.

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

Vines grow up the metal bars in this public park created from an old machine factory.

A lush indoor jungle fills this bustling Madrid transportation hub.

The oldest restaurant in the world is this old-world Spanish eatery, still known for its suckling pig.

A small but charming botanical garden that contains many exotic plant species.

One of the most beautiful bookstores in the world hides a neo-Gothic interior behind an art nouveau facade.

A new sculpture calls attention to climate change in the centuries-old city it threatens.

The plague quarantine island home to the alleged "Vampire of Venice."

Venice's "Island of the Mad."

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

Tucked in the back of a flower shop, its collection details the fascinating history of the Netherlands's iconic symbol.

This unattributed sculpture in Amsterdam is hiding in plain sight.

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.

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

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

One of the best collections of wax anatomical models in the world.