A staircase made of gravestones leads up to this church built into a giant rock.

The Greek island's old British cemetery feels like a forgotten garden.

This black sand beach was crafted from volcanic explosions including the historic Minoan eruption.

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

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

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.

Niagara Falls holds a special place in Nikola Tesla's history, so they put a statue on it.

A memorial to the tens of thousands of Irish who fled to North America during the Great Famine.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

This whimsical fountain pays tribute to Toronto's four-legged friends.

With well over 130 falls and cascades to brag about, Hamilton, Ontario has earned its stripes as the waterfall capital of the world.

This surreal-looking tree pruned more than 1,000 years ago is still producing olives for oil.

Bold black and white motifs of life and death add a dramatic flair to this 17th-century crypt.

The train platform where Jews were sent to concentration camps is now preserved as a Holocaust memorial.

An exclusive waiting room built for the royal family in the 1920s is hidden in Milan’s central station.

A space dedicated to contemporary art and culture, co-chaired by fashion icon Miuccia Prada.

Remnants of cone-shaped fascist bomb shelters in Milan.

Da Vinci's equestrian statue, 500 years in the making.

The odd depiction of the Virgin Mary and baby Jesus is rooted in the Catholic Church's eradication of Catharism.

The secret medieval communication system will whisk your words above the noise of the crowd.

Small on the outside, big on the inside, this church is an astonishing act of visual deception.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.