20 mi from Timberwood Park, Alamodome leads the list

Alamodome: Billy Hathorn, CC BY 3.0 · Alamo Mission: Zygmunt Put Zetpe0202, CC BY-SA 4.0 · Jacob's Well (Texas): Larry D. Moore, CC BY 4.0 · Frost Bank Center: Atristan 77, CC BY-SA 3.0 · Six Flags Fiesta Texas: Chris Hagerman, CC BY-SA 3.0 · Lyndon B. Johnson National Historical Park: National Park Service, Public domain · Tower of the Americas: Larry D. Moore, CC BY 4.0 · Lady Bird Lake: Arvindn on en.wikipedia, CC BY-SA 3.0 · Texas State Cemetery: WhisperToMe, Public domain · Lake Travis: Trey Perry, CC BY 3.0 · SeaWorld San Antonio: TheConduqtor, CC BY-SA 3.0 · Lake Austin: Larry D. Moore, CC BY 4.0 · COTALAND: Larry D. Moore, CC BY 4.0 · Harry Ransom Center: Larry D. Moore, CC BY 4.0 · National Museum of the Pacific War: Ernest Mettendorf, Public domain · San Antonio Missions National Historical Park: Liveon001 ©Travis Witt, CC BY-SA 3.0 · Zilker Park: Mwyzykowski0821, CC BY-SA 4.0 · Bracken Cave: Daniel Spiess, CC BY-SA 2.0 · Hamilton Pool Preserve: Redsully at English Wikipedia, Public domain · Toyota Field: Victor Araiza from Houston, TX, United States of America, CC BY 2.0 · Morgan's Wonderland: Copyright 2010 R.C. French Photography, CC BY-SA 3.0 · Natural Bridge Caverns: Rei at en.wikipedia, CC BY-SA 3.0 · Blanton Museum of Art: Stevensaylor, CC BY-SA 4.0 · San Antonio Zoo: Billy Hathorn, CC BY-SA 3.0 · Majestic Theatre: Zereshk, CC BY 3.0 · Paramount Theatre: Larry D. Moore, CC BY 4.0 · Presidio San Antonio de Bexar: DLS Texas, CC BY-SA 3.0 · Barton Springs: USGS, Public domain · Mission San José: Liveon001 ©Travis Witt, CC BY-SA 3.0 · Fort Sam Houston National Cemetery: U.S. Air Force photo/Tech. Sgt. Larry A. Simmons, Public domain · Bullock Texas State History Museum: WhisperToMe, Public domain · San Antonio Japanese Tea Garden: Brownings at en.wikipedia, CC BY-SA 3.0 · McNay Art Museum: Zereshk, CC BY-SA 3.0 · San Antonio Botanical Garden: Zereshk, CC BY 2.5 · Lady Bird Johnson Wildflower Center: Frank Wolfe, Public domain · ZDT's Amusement Park: Larry D. Moore, CC BY 4.0 · Austin Zoo: Scott218, CC BY-SA 4.0 · Henry B. González Convention Center: Loadmaster (David R. Tribble) This image was made by Loadmaster (David R., CC BY-SA 4.0 · San Antonio Museum of Art: Zereshk, CC BY-SA 3.0 · Witte Museum: Billy Hathorn, CC BY-SA 3.0 · Tobin Center for the Performing Arts: Nightryder84, CC BY-SA 4.0 · Meadows Center for Water and the Environment: Larry D. Moore, CC BY 4.0 · USAF Airman Heritage Museum: Sarayuth Pinthong, Public domain · Buckhorn Saloon & Museum: Gaberlunzi, CC BY-SA 3.0 · Institute of Texan Cultures: Larry D. Moore, CC BY 4.0 · Umlauf Sculpture Garden and Museum: Sculptor:Charles Umlauf, Photographer:Larry D. Moore, CC BY 4.0 · Zilker Botanical Garden: Daderot, CC0 · Brackenridge Park: Larry D. Moore, CC BY 4.0 · Natural Bridge Wildlife Ranch: jdeeringdavis from San Francisco, CA, USA, CC BY 2.0 · Texas Transportation Museum: TParis, CC BY-SA 3.0 · The Contemporary Austin: Matthew Fuller, CC BY-SA 3.0 · General Land Office Building: Larry D. Moore, CC BY 4.0 · Neill-Cochran House: Larry D. Moore, CC BY 4.0 · O. Henry House Museum: Larry D. Moore, CC BY 4.0 · Roosevelt Park: Wynne-Candy, CC BY-SA 3.0 · United States Army Medical Department Museum: TParis, CC BY-SA 3.0 · Blue Star Contemporary Art Center: Wynne-Candy, CC BY-SA 3.0 · Dick's Classic Garage: Larry D. Moore, CC BY 4.0 · Mexic-Arte Museum: Larry D. Moore, CC BY 4.0 · Dr. Joseph M. and Sarah Pound Farmstead: Larry D. Moore, CC BY 4.0 · Lundberg Bakery: Larry D. Moore, CC BY 4.0 · Norton-Polk-Mathis House: Larry D. Moore, CC BY 4.0 · South Austin Museum of Popular Culture: Larry D. Moore, CC BY 4.0 · Wilson County Courthouse and Jail: Larry D. Moore, CC BY 4.0