A monument celebrating the idea of reaching inaccessible places.

A building so large that it has its own weather.

This popular park is home to a sea serpent sculpture that now overshadows the twisted history of its creation.

This replica of the Greek structure is in the heart of Nashville.

The California capital city once stood 10 feet lower than it does today.

The second-largest gold nugget in existence, displayed in a Las Vegas casino conveniently named the Golden Nugget.

This expansive bridge in the Canadian wilderness was originally just built for friends.

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

Hoax, mistake, or evidence of dinosaurs in human times?

A battle between nature and architecture in the Cambodian jungle.

Thailand's distressed elephants find peace at this Chiang Mai sanctuary.

You'll never meet anyone this passionate about elephant droppings.

You can walk up Thailand’s naturally non-slip waterfall.

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

It's just another skyscraper, but it's shaped like '90s cell phone.

The only recreation of William Shakespeare's indoor playhouse.

The graveyard holding the remains of George Washington's slaves was forgotten for nearly 200 years.

The romance of early commercial flight still fills this Art Deco destination.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

A former major munitions plant that has been converted into a sprawling art space.

This rare triple-jurisdiction drawbridge passes through Virginia, Maryland, and Washington, D.C.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

These unusual rooms on wheels are holdovers from the 1960s.

FDR's Art Deco hospital tower was hopelessly inefficient.