Underground City, a digital illustration by Belgian artist <n>Jonas De Ro</n>.

Excavation of a <n>Moai statue</n> on <n>Easter Island</n> during the <n>Norwegian Archaeological Expedition</n>, 1955-56.

The <n>Fyrkat</n> Viking ring castle in Denmark, c. 980 AD. Photo by <n>Ted Spiegel</n> for <n>National Geographic</n>, 1970.

<n>Sweat House</n> on the Cavan Way in County Cavan, Ireland. Photo by <n>Travel Pictures / Alamy Stock Photo</n>.

<n>The Underworld Gate</n>, a digital illustration by artist <n>Eddie Mendoza</n>.

The <n>Castillo de San Miguel</n> in Almuñécar, Spain.

The <n>Church of Saint George</n> in Lalibela, Ethiopia, carved from a single block of rock in the 12th c.

Aesthetic moon design wallpaper by <n>Xininx7</n>.

<n>Red Canyon</n> by <n>Ruxing Gao</n>, an illustration for the game <n>Honor of Kings</n>.

Journey Through the Solar System: Exploring Our Cosmic Neighborhood

A <n>Milky Way Phone Wallpaper Bundle</n> from the studio <n>AestheticxArt</n>.

Aerial view of the <n>Great Sphinx of Giza</n>. Photo by <n>Yousef Alrashed</n>.

<n>Colonnade V</n>, a miniature architectural sculpture in stone by artist <n>Matthew Simmonds</n>.

Digital illustration "black archaeologist" by artist <n>Oleksandr Horbunov</n>.