The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

This historic Victorian hotel has a scandalous history of affairs and murder.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

This distinctive Crescent City tradition dates back to the days of horse-drawn carriages.

The second oldest continuously operating bar in Louisiana.

This symbolic piece of New Orleans architecture is also home to a few ghastly stories.

This historic "City of the Dead" lies prominently in the center of New Orleans' famous Garden District.

Pablo Neruda's custom-built lover's nest was made to remind him of the sea and named after his mistress' hair.

One of the largest ancient geoglyphs in the world is a tall desert god used for predicting the weather.

A sculpture of a giant hand reaches for the stars in the middle of the Atacama desert.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Dramatic river bend surrounds a natural red-rocked pedestal.

Most-visited and most-photographed slot canyon in the American Southwest.

The most famous location in China was home to whole dynasties worth of imperial rulers.

A battle between nature and architecture in the Cambodian jungle.

This $62 million dollar temple was erected to house one little dental fragment of religious history.

Singapore's landscaping project is home to 18 incredible Supertrees.

The sister plane of the C-123 shot down during the Iran-Contra Affair has found a new purpose in retirement.

This neon blue river gets its color from a unique mix of bacteria and volcano minerals.

Sports history, made in the Arroyo Seco.