America's oldest Eastern European synagogue provided the immigrants of crowded Lower East Side tenements a space of sanctuary.

The "Seinfeld" diner.

A crumbling hospital from the 1850s on Roosevelt Island.

At a Bangkok bistro, one pot of beef stew has been cooking non-stop for more than 45 years.

Home to the organ played at General MacArthur's funeral.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

A WWI fighter plane and turn-of-the-century penny candy shop are among the unexpected features of this Financial District building.

Hear the tales of New York's most notorious criminals.

This modern tandoor eatery was once a canteen for Soviet farmers.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

This marker identifies the location where three states converge.

An underground magnet for ever-changing street art.

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

This airport currywurst stand is made out of retro airplane parts.

It appears as if a man is standing behind this giant airport clock, painting the hands in real time.

This airport also offers travelers the chance to view thousands of years of Turkish history.

This 23-foot-tall bear stands amid the hustle and bustle of Hamad International Airport.

This harsh mountain path was built as a strange attempt to improve the health of Turkmen citizens.

This pagoda was once the central feature of a Buddhist temple that no longer exists.

A unique structure located on the grounds of one of five grand palaces that were built by the Joseon dynasty.

The name of the only golden Buddhist temple in Korea translates as "the temple that protects the country."

Its humdrum facade only adds to its electrifying appeal: a rooftop with panoramic views of a shapeshifting metropolis.

The site of many tense prisoner exchanges across the Military Demarcation Line between North and South Korea.

Ancient temple is home to centuries of art and spiritual artifacts.