During this time, a chain link fence in front of the base of the boulder wall has been in place to stop any loose boulders from coming down on to the sidewalk or onto South Park Drive. Powell said ...

researchers at ETH Zurich have let an autonomous excavator loose on a big pile of boulders and reclaimed concrete. The goal? To build a 20 foot (6 meter) and 213 ft (65 m) long dry-stone wall as ...

Loose chalk is not allowed ... Shirts must also be worn. Only climbing wall staff may change, modify, and adjust climbing holds, routes, and boulder problems. Only Outdoor Program staff are allowed to ...