Enter this small nook and you'll be surrounded by 360 degrees of street art.

This alley off Edinburgh's Royal Mile contains remnants of the city's seedier history.

This early version of the guillotine was used to execute the man responsible for its construction.

Remnants of the 16th-century defensive wall still stand unassumingly within Edinburgh.

This obscure walkway links Edinburgh’s Old Town with one of the city's prime vantage points.

This small museum in a 17th-century building honors three iconic Scottish writers.

This otherwise ordinary close on the Royal Mile constituted the end of the world for Edinburgh’s poorest residents.

A 18th century graveyard and its astonishing cortege of macabre iconography.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

This memorial to World War II's fallen airmen shows us the movements of the stars that once guided them.

A cablecar-station-turned-revolving restaurant with 360-degree views of the Swiss skyline.

A historic observatory precariously perched at the "Top of Europe."

Lucerne's central prison was converted into a tourist hotel with a bare minimum of changes.

Ozymandias’ time-keeping temple.

A network of ancient Egyptian tombs built into the cliff face along the Nile.

The largest known Ancient Egyptian obelisk.

One of the most well-preserved temples of ancient Egypt.

These Egyptian statues have survived for 3,400 years and were an acoustic wonder of the ancient world.

The city-sized home palace of one of ancient Egypt's most powerful rulers gives us a rare look into the lives of the epoch's rulers.

Known as the Sistine Chapel of Egypt, this tomb houses some of the most well-preserved paintings in Egypt.

An endless sea of white conical domes.

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

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

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