A commemoration of the little-known cultural influence that Tolstoy had on India.

The former Willingdon Airport started operations in 1929, in India's capital, Delhi. Now, it's used for maintenance runs and helicopter rides.

The mysterious empty cupola behind the monumental arch points to an ancient prophecy of Delhi.

India's first open-air public art district sits in the heart of the country's capital.

A favorite haunt of Delhi's politicos and intellectuals, this old-school coffee shop was shut down under Indira Gandhi's Emergency.

Ancient traditions and surreal birdwatching come into sharp relief along one of the world's most polluted rivers.

A blooming house of worship for the masses.

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

A curious building honoring past and current members of a historic musical comedy troupe.

The oldest surviving presidential residence in the United States.

Alexander Hamilton’s creation caused quite a bit of controversy.

The sounds of the world's largest fully functioning pipe organ dazzle shoppers at a Philadelphia Macy's.

This elaborate towering structure was once famed for its revolutionary height.

The first American department store, and home to the largest operating musical instrument in the world.

Dr Barnes' $25 billion private collection of art and arboretum.

Huge masonic hall in Philadelphia with lavishly themed rooms.

This Philly cemetery is the eternal home of many famous area residents, including Rocky Balboa's wife.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

A layered tribute to the work of mosaicist Isaiah Zagar.

World's first "penitentiary," meant to be humane, drove men insane.

The only nuclear weapon assembly and disassembly plant in the U.S.

The top of a giant mesa, just outside of Amarillo, appears to float in the sky above.

A time-capsule monument reminding future generations of the importance of efficient and effective use of natural resources.