An attractive alpine lake at 8,400 feet that is accessible via a paved road.

This small cave in the center of Isla Colon doubles as a sanctuary.

Take a few seconds to look at this abandoned, art-filled station as you pass by on the subway to Ueno.

A pair of towering monuments commemorate two of Kazakhstan's greatest poets and philosophers.

The tallest church in Mechelen might have been the tallest in the world if not for a lack of funds.

The intricate geometry inside this Baroque-style dome was designed to create "terror of the human soul."

An icon of the city, this chapel features an amazing dome ceiling and offers panoramic views.

This magnificent Art Deco church is a reflection of Lithuania’s turbulent history.

This beautiful 150-year-old synagogue survived Italy's fascist period and the Second World War.

This chapel on a cliff is renowned for its healing powers and was founded on the site of a supposed divine intervention.

This colorful gate stands as an entrance to the walled city of Old San Juan.

Two awe-inspiring globes from the reign of the Sun King hang from the ceiling of France's national library.

The remains of an entire Roman city can be explored in this interactive museum.

Hungarian self-built castle.

This moss-covered, rocky outcropping looks like a mythical beast resting in the water.

This stunning iron gate designed by Modernist architect Antoni Gaudí is filled with mythic symbolism.

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

The highest pedestrian bridge in Singapore looks like a series of undulating waves rising between two public parks.

Down a cobblestone alleyway is a museum dedicated to Romanticism, with a secret garden.

Claude Monet was baptized in this lavishly ornate Paris church.

A former military outpost of Ivan the Terrible, the 16th-century church contains some of the rarest examples of Eastern Orthodox mural paintings.

This mosaic-lined medieval church was built by the world's first admiral and still holds mass in ancient Greek.

The walls and ceilings of the "Mexican Sistine Chapel" are almost completely covered with mural, sculpture, inscriptions and oil paintings.

Numerous stone coffins from different centuries, lined up in a sixth century basilica.