Houston's Official City Tour! From the HCT Visitors Center, explore Houston on a 80-minute Houston sightseeing tour, which travels by double-and single deck unique open top buses around the city including sights such as Convention center, Minute Maid Park, Historic District & Market Square, Downtown Aquarium, Houston Heritage Society Park, Financial District, Midtown and more. Enjoy unobstructed views of breathtaking architecture and live onboard commentary. Experience Houston's most noteworthy attraction and explore Houston like never before! Alternate vehicles may be used according to number of passengers, weather or traffic conditions.