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

Elevated freight railway turned wildly successful urban park.

An enormous, inside-out glass globe built in 1935.

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

A terrific purveyor of natural history objects and curios.

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

Singapore's landscaping project is home to 18 incredible Supertrees.

The original home of the Lego has a huge amusement park dedicated to the iconic plastic toy.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Step into a cartoon at this Seoul café that aims to evoke a two-dimensional scene.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

These aggressively sustainable art homes look like something out of 1970's science fiction.

A lush indoor jungle fills this bustling Madrid transportation hub.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

America's most famous piece of self-built architecture.

A hidden world of exotic succulents and cacti.

San Francisco Bay's ghost town.

This former coal gasification plant found a curious second life as a popular public park.

A walk through the historic city center, under the streets of Seattle.

A huge musical sculpture and other art installations on the National Oceanic and Atmospheric Administration grounds.

Nose around a unique collection of more than 300 natural aromas used to craft perfume fragrances.

An amazing collection of fantastic reptiles, amphibians, spiders, and insects.