DOWNTOWN'S "underground" is a system of tunnels 20 feet below Houston's downtown streets and more than 6 miles long. Having started out years ago as a tunnel between two downtown movie theaters, today it includes restaurants and service retail and connects 95 city blocks. Only Wells Fargo Plaza and McKinney Garage on Main offers direct access from the street to the tunnel; otherwise, entry points are from street-level stairs, escalators, and elevators located inside office buildings that are connected to the tunnel.

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The tunnels are an amenity for the large office population so are open only Monday-Friday from approximately 6 a.m. to 6:30 p.m.