Probably in response to the seven wonders of the ancient world, and perhaps also to the American Society of Civil Engineers seven wonders of the modern world, several lists naming the seven natural wonders of the modern world have been promulgated. The following list is typical, if not authoritative:

SEVEN NATURAL WONDERS OF THE MODERN WORLD
Natural Wonder	Location	Description
Grand Canyon	Arizona	This huge canyon was created by millions of years of erosion and established as a national park in 1919.
Northern Lights	The sky	Also called the aurora borealis, the northern lights are caused by the interaction of Earth’s magnetic field with the particles in the solar wind.
Mt. Everest	The Himalayan Range, bordering Nepal and China	The first recorded climb was achieved by Sir Edmund Hillary of New Zealand and Sherpa Tenzing Norgay on 29 May 1953.
Paricutin	Mexico	This young volcano that was “born” in 1943 was, unlike most other volcanos, observed in the making.
Harbor at Rio de Janeiro	Brazil	The harbor, punctuated by mountains, was home to Tupi Indians before the arrival of Portuguese explorers in 1502.
Victoria Falls	Border between Zambia and Zimbabwe	Named for his queen by Scottish missionary David Livingstone in 1855, the falls are 1.25 miles (2 km) wide.
Great Barrier Reef	Australia	This coral reef is 1,242 miles (2,000 km) long, threatened by pollution and host to a wide variety of ocean life.

Other contenders for the list of seven natural wonders of the modern world mentioned in other sources include the following – notice how many are falls and mountains:

• Natural Bridge, a rock formation in Rockbridge Country, Virginia
• Table Mountain, a 3,567 ft (1,087 m) flat-topped mountain in Capetown
• Reelfoot Lake, apparently created by the New Madrid earthquakes in 1811-12
• Crater Lake, the deepest lake in the US, formed by a volcanic crater in the Cascade Range in Oregon
• Yosemite Falls, a series of waterfalls in Yosemite National Park in California
• Mauna Loa, an active volcano 13,680 ft (4.172 m) tall in Hawaii
• Niagara Falls, 158 ft (48 m) falls between New York and Canada
• Angel Falls, the highest waterfall, located in in Venezuela
• The Bay of Fundy, between New Brunswick and Nova Scotia, Canada, noted for tides
• Iguassu Falls, a group of hundreds of waterfalls on the Brazil/Argentina border
• Krakatoa Island, the volcanic island in Indonesia where a huge volcanic explosion in 1883 and the following tsunami were responsible for many deaths
• Mount Fuji, a volcanic mountain that is the highest in Japan at 12,389 (3776 m)
• Mount Kilimanjaro, the highest mountain of Africa, located in Tanzania and reaching 17,564 ft (5,354 m)

There are also more localized lists of that include natural wonders of the modern world, including the traditional seven wonders of Wales named in the nursery rhyme:

Pistyll Rhaeadr and Wrexham steeple,Snowdon's mountain without its people,Overton Yew-trees, St. Winifred wells,Llangollen Bridge and Gresford bells

Obviously, the steeple, wells, bridge, and bells were made by humans, but the 240 ft (74 m) waterfall Pistyll Rhaeadr, Mt. Snowdon in Snowdonia National Park in Northwest Wales, and the 21 famous yew trees in the churchyard of St. Mary’s Church in Overton are all natural wonders of the modern world.

Another take-off is the extended list. There are several “100 wonders of the World” lists on the Internet, and nearly all feature a combination of built wonders and natural wonders of the modern world.