An ancient instrument used to measure the waters of the Nile so Egyptian farmers would know whether to expect famine or flood.

Standing atop 2nd-century Roman ruins, this church is one of the oldest and most iconic in Old Cairo.

Hundreds of thousands of ancient documents offer a unique glimpse into Jewish life in Cairo.

The massive cave church of Cairo's Zabbaleen community is one of the largest Christian churches in the Middle East.

Slum Settlement Filled With Mountains of Garbage.

The oldest Egyptian obelisk still standing in its original site.

The medieval center of the Islamic world was also once the seat of Saladin's sultanate.

The sculpture is made of more than 100,000 knives collected to raise awareness about violence.

The longest and tallest aqueduct in Britain can actually be sailed across.

These precariously placed ruins harken back to a 13th-century castle.

This ancient abbey now lies in majestic ruin behind a caravan park.

Also known as "Leicester's Folly," this almost cathedral was left unfinished and in ruins.

Picturesque ruins once held off mighty armies.

The oldest continual pilgrimage site in Britain was supposedly created by a gruesome beheading.

This 1776 beacon on the coast of Wales is said to have a ghost called Raymond, the last lighthouse keeper.

This mysterious wheel-cross is the tallest in Britain.

The western face was supposedly left clock-less to snub the Welsh.

Chester Cathedral is home to a unique painting crafted on a canvas of cobwebs.

Once the last route taken by condemned prisoners.

Western Europe's only representation of a Roman goddess still in its original location sits in an unassuming park.

A rare World War II-era siren still survives in the southern suburbs of Manchester.

One of the world's oldest trees comes with a Welsh legend intertwining it with a spirit prophesying death.

Roman ruins found on the outskirts of a small town on the North Wales coast have over time become a strong part of the community's identity.

At the United Kingdom's only residential library you can sleep among the books.