Downtown Aquarium, Houston, Public aquarium in downtown Houston, United States.

The Downtown Aquarium occupies a 6-acre site at 410 Bagby Street, built around Fire Station No. 1 and the Central Waterworks Building. Its pale gray facade carries round blue-framed porthole windows and two rooftop signs reading "AQUARIUM" and "RESTAURANT". Inside, the Aquarium Adventure exhibit holds over 200 species in 500,000 US gallons, from a Louisiana Swamp section to a sunken 17th-century Spanish galleon and a Gulf of Mexico oil-rig habitat.

The building began as Fire Station No. 1, then was transformed into an aquarium complex that opened to the public. This conversion brought a new purpose to an older downtown Houston structure.

The name comes from the venue's downtown site at 410 Bagby Street, built around Fire Station No. 1 and the Central Waterworks Building. The education department runs school-group visits and outreach programs, and the aquarium offers Marine Biologist for a Day, Zoologist for a Day, Sea Safari Camp and overnight stays. A white tiger exhibit added in the 2000s drew protests from animal rights activists from late 2015.

The 6-acre site at 410 Bagby Street holds the main aquarium building, two restaurants, a bar, banquet rooms and outdoor rides, so plan your route around the Shark Voyage train that circles the property and stops inside a 200,000-gallon shark habitat. The train is a 2 ft narrow-gauge C.P. Huntington ride, and in April 2018 it became the first electric one built by Chance Rides.

The restaurant holds a 110,000-US-gallon cylindrical tank, described as the largest of its kind in the United States. Outside, the Shark Voyage train, a 2 ft narrow-gauge C. P. Huntington ride built by Chance Rides, stops inside a 200,000-US-gallon shark habitat. In April 2018 the site received the 400th C. P. Huntington built, the first electric one.