The Grande Dixence dam in Switzerland

The Grande Dixence dam is pictured with the Lac des Dix in Pralong near Sion in southern Switzerland August 16, 2008. Hydroelectric power accounts for about 58% of Switzerland's electricity production. The dam, situated at 2365 meters above sea level, has a height of 285 metres and is the highest gravity dam in the world. It weighs 15 million tonnes, was made with 6 million cubic metres of concrete and has a water capacity of 400 million cubic metres, collecting water from 35 surrounding glaciers.

Grand Canyon Skywalk & Clip

The Grand Canyon Skywalk is a tourist attraction along the Colorado River on the edge of the Grand Canyon (Grand Canyon West) in the U.S. state of Arizona.

Commissioned by the Hualapai Indian tribe, it was unveiled March 20, 2007, and opened to the general public on March 28, 2007. It is accessed via the Grand Canyon West terminal or a 120 miles (190 km) drive from Las Vegas, which includes an unpaved and bumpy 18 miles (29 km) stretch. A walk on the skywalk is available for a $29.95 admission fee plus tax, which is paid to the Hualapai Indian tribe at the Skywalk itself. That is in addition to the short 7- to 10-minute coach ride for which the Hualapai Tribe charges $29.95 ($59.90 per person, $20 to park a car, plus tax).

The horseshoe-shaped glass walkway, at a 1,200-meter (4,000-feet) height above the floor of the canyon exceeds those of the world's largest skyscrapers.[1] The Skywalk is not directly above the main canyon, Granite Gorge, which contains the Colorado River. Instead it extends over a side canyon and affords a view into the main canyon.[2] USGS topographic maps[1] show the elevation at the Skywalk's location as 1,454 m (4,770 ft) and the elevation of the Colorado River in the base of the canyon as 354 m (1,161 ft).

Mount Logan, Canada

Mount Logan is Canada's highest mountain and the second-highest peak in North America, after Mount McKinley. The mountain was named after Sir William Edmond Logan, a Canadian geologist and founder of the Geological Survey of Canada (GSC). Mount Logan is located within Kluane National Park and Reserve in southwestern Yukon and is the source of the Hubbard and Logan Glaciers. Logan reportedly has the largest base circumference of any mountain on Earth.

Due to active tectonic uplifting, Mount Logan is actually still rising in elevation. Before 1992, the exact height of Mount Logan was unknown and measurements ranged from 5,959 metres (19,551 ft) to 6,050 metres (19,849 ft). In May 1992, a GSC expedition climbed Mount Logan and fixed the current height of 5,959 metres (19,551 ft) using GPS.

Temperatures are extremely cold on and near Mount Logan. On May 26, 1991 a record −77.5 °C (−108 °F) was observed, making it the coldest recorded temperature outside of Antarctica. It is not counted as the coldest temperature in North America since it was recorded at a very high altitude.