Discover how Houston's residents beat the heat as you tour the highest buildings and web of tunnels that make up the city. Kick off this Houston tour from Georgia's Market, where you will learn about the epic Downtown Houston Tunnel System, then walk over to Chase Tower, Texas' tallest building. Pause for a photo in front of Joan Miro's brightly-coloured Personage & Birds sculpture, then go inside the massive tower and ride the elevator up to the 60th-floor sky lobby. Take in the sweeping views that take in the city's famous skyline.

Next, explore the city from beneath as you descend six meters (20 feet) below the city streets into one of the Tunnel System's ten colorful food courts. Walk through the air-conditioned Tunnel to the 1929 Chase Building, then take an elevator up to its Art Deco banking hall. Look at a stained-glass window portraying the 1836 Battle of San Jacinto, where Texas won its independence from Mexico, and eight frescoes depicting the history of Texas. Descend back into the Tunnel and walk into a food court where you can enjoy a Dutch-style lunch as you watch the hum of Houston's work force walk by. Stroll into One Shell Plaza and meet the owners of an underground gift shop before taking an escalator up to the street.

Walk through Hermann Square Park into Houston's City Hall and Visitors Center. Get a history lesson by watching a video about the city, pose for a photo with a life-size statue of its namesake, and check out some of its many fascinating exhibits. Head into the Theater District Garage, before reentering the Tunnel to walk to two of Philip Johnson's architectural masterpieces - the 1976 Modern Pennzoil Place and 1983 Post-Modern Bank of America Center. Return above ground in the city's bustling Theater District, where this Houston walking tour comes to an end.

Tour start time: 10:30am