United States Botanic Garden - Washington D.C.

The United States Botanic Garden features a 40,000 square foot greenhouse which contains over 60,000 plants. Established in 1820 and open to the public in 1850, it is one of the oldest in North America.

The greenhouse is divided into several areas....

The orchid room.
World deserts where I adored this Old Man Cactus.
These tulips were in the Children's Garden, where kids could actually dig in the dirt and water plants with supervision.
This view is from the catwalk around the top of the jungle room.There were also areas of primeval garden, medicinal plants, and rare and endangered species. I snapped a lot of photos, but I'll share a few favorites.