Municipal swimming pools flourished in the 20th century. But too often, their success was based on the exclusion of African Americans.
Steel roller coasters remain hugely popular. But virtual reality is becoming an increasingly important addition to the industry.
Rollercoasters have grown higher, faster, loopier and they've even entered the virtual world. Soon you might not even need to visit a theme park to enjoy the ride.
Knott's Berry Farm and others romanticize the state's past and influence visitors’ sense of history. But their ideology reflects mid-20th-century political conservatism more than settlers' reality.
Investigations into the tragic accident which left four people dead at an amusement park could lead to changes in the safety regulations.
The virtual reality rides of the early 20th century are now being documented in digital VR.