A remnant of the original World Trade Center complex continues to serve as a commuter gateway.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

This cemetery has graves dating back to the 17th century, including the city's oldest carved tombstone and an ominous cryptogram.

Stalinist skyscraper built with help of cryotechnology.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

World's largest bell sits on the grounds of the Kremlin in Moscow.

Moscow's most popular cemetery includes the graves of numerous cosmonauts.

A symbol of the early days of skiing in Australia

This area was created to save the region's koala population.

This outdoor museum harkens back to the height of the gold rush.

A timber wharf that contributed to Echuca becoming the largest inland port in 19th-century Australia.

Final resting place for hundreds of prisoners of war.

Major tourist destination known for its bubbling mud-pools and hot thermal springs.

Relics of Australia's convict past, and a modern scene of unimaginable horror.

What looks like a simple quaint estate in rural Pennsylvania was in the 18th century home to a small monastic community.

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

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

This beloved marketplace mascot poops money and grants good luck.

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

An abandoned asylum once on the cutting edge of lobotomies may be reborn as a Christian college.

A formerly abandoned mental institute, now back in business.

Beneath the mossy overgrowth covering this once-sprawling campus lies decades of history and the secrets that come with it.

Once the site of seances, this restaurant is said to be haunted by several ghosts.