Enjoy a panoramic view of Houston from the top of the company's Double Decker bus. Guests can start their tour at a Cowboy themed Visitors center . Things to see, include the George R. Brown Convention Center, Market Square Park, Houston historic district, Murals, Downtown Aquarium, Main street, Hermann square and the Financial District. The complete loop takes a little less than an hour-and-a-half. Guided by local experts, Houston bus tours provide in-depth knowledge about the area's most popular districts, neighborhoods and traditions, while also giving travelers the opportunity to add more attractions to their visit. Choose from Downtown Aquarium , Museums , NASA Space center, Tunnel system and more, which showcase some of Houston’s most significant sites. Houston City Tours also provides reliable private group tours and charter ground transportation.