Acequias of San Antonio — One of the earliest recorded uses of an engineered water supply and irrigation system in the country, the acequias were built starting in 1718 to serve the Spanish missions in the area. Designated in 1968.
El Camino Real (Royal Road), East — A major transportation artery begun in the 16th century, it eventually stretched from the present Republic of Mexico through Texas and east to Florida. Designated in 1986.
Houston Ship Channel — The first Houston ship channel was a simple dredged channel in 1839. The modern channel opened in 1914 and has been improved often since that time. It is an engineering project of major complexity. Designated in 1987.
Denison Dam on the Red River — It was the largest rolled-earth-fill dam in the country when it was completed in 1945. Designated in 1993.
San Jacinto Monument, Houston — This monument marking the battlefield of the final Texas victory in the war for independence from Mexico was the world's tallest free-standing concrete tower at the time of construction in 1936-39. Designated in 1992.
San Antonio's River Walk — Opened in 1939, the River Walk combines flood control with graceful design and respect for the natural beauty of the river. It is an international travel destination, as well. Designated in 1996.
National Bank of Commerce Building, Houston — The foundation design for this building, erected in 1927-28, was the first application of the then-new field of soil mechanics to a building in the Houston region. Designated in 1997.
— from the Texas Almanac 1998–1999.
