Once a state-of-the-art tuberculosis treatment spa, these ruins are now ruled by paintball players.

This former estate of a fascist leader is now a burnt out ruin leading to a system of secret tunnels.

This scale model of our solar system hid in plain sight for years before a physics team sought out all the planets.

A World War II evacuation tunnel turned into a history display of Croatian state and people.

This 135-year-old weather station studied the effects of the climate on human health.

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

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

A place for local artists to showcase their works.

Adjacent to Narayanhiti Palace, this park commemorates those who fought in Nepal's civil war.

Hiding in plain sight near Kathmandu’s government center is a giant mandala that has become a locus for political protest.

This Kathmandu museum, built in an Austrian modernist style, looks like a set from Star Wars.

This conservation area filled with colorful birds is the last community forest within the city of Kathmandu.

This historic square in Nepal is home to temples dating back to the third century.

This elegant neoclassical garden is a peaceful oasis in the middle of the Nepalese capital.

This tranquil park with a spiral viewing tower is an off-the-beaten-path area where renowned people have planted a small grove of trees.

A former reservoir that was only recently discovered after more than 60 years of disuse.

A dinosaur-laden walking trail outside Singapore's Changi Airport.

Rainbow shutters decorate this former police station.

This family-owned pottery shop is home to the last operational dragon kiln in Singapore.

A disused quarry turned lake in the middle of a residential district.

The busy transport hub is home to the tallest airport slide in the world.

The first Catholic church in Singapore is a Neo-Gothic colossus with a rich architectural history.

A historical convent known for taking in bad luck babies left on its doorstep is now an upscale shopping center.

Terrapins of all colors and shapes are quick to bring fascination (and possibly long life) at this museum.