Recently I was checking out online the Texas Longhorns ballpark, when I came across references to their prior playing site, Clark Field. Being interested in old ballparks, I looked it up on Wikipedia, and found a very strange baseball facility that featured a hill/cliff that was in the field of play:
Clark Field (1928) - Wikipedia
"Clark Field was unusual because there was a 12- to 30-foot (9.1 m) limestone cliff that ran from left-center to center field that made playing the outfield adventurous. The cliff could only be accessed via a goat path in the left-center field. Center field was nicknamed "Billy Goat Hill."
[2] There was a scoreboard on top of the hill in the field in front of the fence that could cause even more weird bounces for outfielders. Clearly, this gave the Longhorns a home field advantage over visiting teams. For example, the Longhorns could easily get an inside-the-park home run when a ball was hit in the direction of the cliff because the opposing outfielders were perplexed by its caroms and how to make plays by using the cliff. Longhorn outfielders could typically hold batters to a double or triple because of their familiarity with the cliff. Half of the team's outfielders purportedly chose to play on top while the other half chose to play in front of the cliff.
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Here's a photo from Wikipedia of the field, with the cliff in full view
Clark Field, with the famous goat path and hill visible in the outfield. LBJ Library can be seen in the background, to the east/southeast.
Memorial Stadium is just out of frame, located behind the right field wall.