Unique! In the true sense.
There is simply no other place in the world like this: a garden of primoridal ooze in the center of a metropolitan business district. It's not a theme park. The unrefined tar is real, the methane emissions that bubble and bloop emerge from deep underground. And the smell! It evokes a past chronicled only by fossils dug from the goo.
Hancock Park is situated around the pits, so there's no cost to view them, nor to watch paleontologists work in pits during the summer months (when the tar is more supple). Watch your step along the path or as you kneel beside the small stream to catch a look at the crayfish! The pits are not the only places tar seeps from the ground.
There is a small charge for the Page Museum, but it's well worth it. It has some hands-on exhibits, dioramas, and a massive collection of fossils ranging from spores to sloths removed from the pits. Dire wolves especially enjoyed feasting on animals trapped in the tar. An entire wall is filled with a display of their skulls. At certain times of the day, expert and amateur paleontologists can be observed in a sort of glass tank, cleaning away the accumulations from fossils.