Where to find Austin-area dinosaur tracks

• Scientists say they may have belonged to acrocanthosaurus, a roughly four-ton, T-Rex-like predator who roamed these parts more than 100 million years ago.
• The footprints are so perfect they almost look fake.

Speaking of: There are some round impressions in the riverbed that some people say are also dino prints.

• You'll find yourself looking at shapes in the limestone as if you're divining forms in the clouds.

Keeping it real: It's very urban adventure-y. You park by a highway construction site and head down a gravel scramble before cutting through some tall grasses to the smooth-rock river bed — about a 20-minute walk each way. It's easy enough even for little kids.

If you go: Park on the shoulder of Green Valley Drive, right across from the ARC Abatement offices.

• Pro tip: Make sure to bring water and some snacks — there's a nice limestone ledge just by the tracks, perfect for a mini-picnic.