An artesian spring and Texas' most famous underwater cave; hiking and viewing only — swimming has been suspended since 2022.
Jacob's Well is the Hill Country's strangest beauty: a 12-foot-wide artesian spring that drops into the longest fully submerged cave system in Texas, glowing an improbable blue against the limestone. It feeds Cypress Creek, which feeds Blue Hole downstream — Wimberley's whole water story starts here.
Be straight with your guests: swimming has been suspended since June 2022 because of drought-driven low flow, and Hays County signals no near-term reopening. What remains is a short, genuinely photogenic hike through the natural area to the viewing area over the well — open daily 8 a.m. to 6 p.m., with no entry after 5:30.
As a wedding-weekend stop it pairs with the square's shops or the Leaning Pear for lunch: an hour of Hill Country geology without committing the whole afternoon.