Hidden in the shadow of a rocky fortress is one concubine’s long-forgotten legacy.

A startling, centuries-old subterranean marvel hides in plain sight.

A blooming house of worship for the masses.

This magnificent stepwell is designed as an inverted temple and adorned with 1,500 sculptures.

This peaceful Sikh gurudwara serves around 50,000 free meals every day within its gilded walls.

The world's second-largest sundial, made entirely out of stone.

Sacred Indian temple that’s all monkey business.

More than half of this Indian palace is drowned but it looks all the more spectacular for it.

The 953 windows undoubtedly make this the world's most beautiful screened porch.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

A mother’s sweet tradition lives on with this unique memorial.

This abandoned viewing platform has become a monument to unnecessary government spending.

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

These charming mailboxes became social media stars after a typhoon failed to topple them.

The fifth-longest natural arch in the world, and the longest outside China.

Many people don't realize there’s a lot going on in—and below—the world’s tallest triumphal arch.

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

This remnant of an ancient Persian city is considered to be the world's largest single-span brick vault arch.

This striking arch, one of the first architectural elements constructed in Prospect Park, was recently restored to its original glory.

This magnificent arch is all that remains of a former smelt mill.

This unique architectural wonder is home to luxury apartments.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

This recipe is set in stone.