In Chicago, a pizza-enthusiast has opened a museum dedicated to the history of pizza.

The final resting place of up to 6,000 Confederate soldiers, the largest mass grave in the Western Hemisphere.

A strange and haunting monument of unknown origin in the historic Graceland Cemetery.

First planned industrial community in the United States.

Cemetery featuring rare glass-fronted columbarium.

A hollow cement depiction of time's inexorable effect on the human body.

An enormous park-like oasis, full of famous Chicagoans' graves.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

2300-year-old Roman road connecting the empire.

A station built to repel pirates now attracts wealthy vacationers.

The world's longest outdoor covered escalator system transports commuters through Hong Kong's hilly terrain.

Teeming with illegal goods and services, this towering maze of vice is also a popular tourist accommodation.

Remnants of the most densely packed city in world history, that thrived on anarchy for 30 years.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

Slum Settlement Filled With Mountains of Garbage.

In Egypt's expanding metro area, many of the neighbors are dead.

The comedy and tragedy of Oscar Wilde is preserved in a Dublin park, captured in a sculpture of colorful stone.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

A tiny piece of the Moon is embedded in this stained glass masterpiece.

The longest escalator in the Western Hemisphere takes over three minutes to ride down.

The tallest The Church of Jesus Christ of Latter-day Saints temple in the world soars above the Beltway.

A girls' boarding school inspired by the Chicago World's Fair, once abandoned, now restored to strange and scenic glory.