Dun Briste Sea Stack, Ireland

Dun Briste (Gaelic for Broken Fort) is an incredible, 45 metres (150 feet) tall sea stack in Ireland.

Dun Briste and the surrounding cliffs were formed around 350 million years ago, when sea temperatures were much higher and the coastline at a greater distance away. Dun Briste was once part of the mailand. There was an arch leading to the rock, but it is believed to have collapsed during very rough sea conditions in 1393. This is remarkably recent in geological terms.

Oeschinen Lake, Switzerland

Oeschinen Lake (Oeschinensee) is a beautiful mountain lake in the Bernese Oberland, Switzerland. This turquoise lake with the dramatic mountain scenery in the Oeschinen valley is one of the most beautiful mountain lakes in Switzerland.

Oeschinen Lake is very close to Kandersteg in the Oeschinen valley. A gondola lift from Kandersteg leads to Oeschinen, 25 minutes by foot from the lake. The lake is generally frozen during five months, from December to May. From time to time ice skating is possible on ice.

At an elevation of 1,578 metres, the lake is fed through a series of mountain creeks and drains underground. Its maximum depth is just 56 metres (184 ft). Since 2007 the lake is part of the Jungfrau-Aletsch-Bietschhorn UNESCO World Heritage Site.

Twelve Apostles, Australia

The Twelve Apostles is one of the most well-known highlights of the Australia's Great Ocean Road.

They are massive limestone structures that tower 45 metres above the tempestuous Southern Ocean. Created by constant erosion of the limestone cliffs of the mainland beginning 10–20 million years ago, the stormy Southern Ocean and blasting winds gradually eroded the softer limestone, forming caves in the cliffs. The caves eventually became arches and when they collapsed rock stacks were left isolated from the shore. Behind the eight remaining stacks (five have fallen since their discovery) are majestic cliffs, around 70 metres high.

The Twelve Apostles are located 275 kilometres west of Melbourne in the Port Campbell National Park, approximately a four-hour drive along the Great Ocean Road.