Zimbabwe's Great Enclosure was built without mortar using dry-stone masonry between 1100–1450 AD.

The 1980 eruption of Mount St. Helens reshaped the surrounding landscape.

The Aswan High Dam controls flooding of the Nile River.

The Ganges Delta is the world's largest river delta, covering over 100,000 square kilometers.

The country of San Marino claims to be the world's oldest republic, founded in 301 AD.

There are places on Earth that have never been explored.

The Nile is generally considered the world's longest river, but some measurements put the Amazon ahead depending on source point.

There are abandoned cities on Earth that nature is slowly reclaiming.

New Zealand was the first country to give women the right to vote, in 1893.