Starved Rock
Starved Rock is a prominent, some 30 m tall cliff at Illinois River. In the small side valleys have formed 18 beautiful canyons in sandstone rocks.
Garden of the Gods in the Shawnee National Forest
Uplifted sandstone plateau with diverse interesting rock formations – hoodoos, rock pillars, narrow canyons.
Lusk Creek Canyon (Indian Kitchen)
Impressive canyon on Lusk Creek that has formed in Pennsylvanian sandstone. The area contains many rare and endangered species of plants.
Little Grand Canyon in Shawnee National Forest
A system of small canyons that have been cut in the sandstone by perennial streams. Here are several perennial waterfalls.
Natural Bridge in Bell Smith Springs
Large natural arch that has formed in sandstone and has a span of 38 meters.
Open Ceiling Cave
Collapsed sea cave – a circular sea basin that is connected to the sea with a large cave – natural arch that is some 13 m wide. Sea waves enter this cave. In the middle of this basin stands small island – remnants of the fallen cave ceiling.
City of Arches at Honaunau Bay
Some 3 km long stretch of sea shore with numerous interesting geological formations in pahoehoe lava: natural arches, sinkholes and also several blowholes.
Blackman’s Bay Blowhole
Impressive collapsed sea cave – former blowhole. Now it forms a large natural bridge with a road going over it.
Devil’s Bridge in Antigua
Natural bridge at the sea with a stormy basin between the bridge and mainland. The bridge is some 20 m long and up to 4 m wide. There are several smaller blowholes at this natural arch.
Punakaiki Pancake Rocks and Blowholes
Unusual seaside cliffs that are formed from numerous thin layers of Oligocene limestone. As a result, there have formed diverse cliff formations that at some places resemble heaps of pancakes. In the jagged cliffs have formed smaller natural arches and several roaring blowholes. These blowholes are especially impressive at high tide and strong south-western winds.