Top Houston Aquariums

Step beneath the streets and uncover a side of Houston most locals never even see. Our city-famous Tunnel Tour—rated the top city tour in Houston for over 8 years and running—takes you deep into the largest downtown tunnel system in the United States, where a vibrant underground world connects iconic skyscrapers, historical architecture, and modern business hubs. Escape the Texas heat in air-conditioned comfort as you explore this hidden metropolis, packed with fascinating stories, striking architecture, and unexpected surprises around every corner. You’ll visit award-winning buildings, discover the original Texas skyscraper and Houston’s oldest bank, and even snap unforgettable photos—including a stop inside a vintage 1959 BMW. Along the way, your guide will share insider secrets, rich history, and fun facts that bring Houston’s past and present to life. It’s part history tour, part architectural adventure, and all-around one of the most unique experiences in the city!