The hike in car ownership not only caused high traffic, but also led to drivers parking their cars on the sidewalks.

Short hikes lead to several other volcanic features, but some areas are accessible only by aircraft.

The road offers no services, but several short hikes lead from it, including one to a petroglyph field.

A long hike up a rocky hillside eventually leads to a cornfield.

A relatively short hike on a graded trail leads to the bottom of the valley.

A 0.75-mile (1.1-km) hike leads to the edge of the crater's rim.

A relatively steep hike along a surprisingly narrow path leads to two trail markers.

A longer hike leads to the valley floor.

In the bottom of the valley a multiday hike leads along the river Rhine.

An easy hike through steps leads to the caves.