This 16th-century close preserves an unusual piece of Edinburgh's transportation history.

This alley off Edinburgh's Royal Mile contains remnants of the city's seedier history.

Sprawled across the Great Hall ceiling are various constellations and images relating to the zodiac.

There are plenty of wonderful panoramic vistas in Edinburgh, but not many are hidden smack in the middle of the Old Town.

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

The fountain marks the area where hundreds of accused witches were burned at the stake.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

At 207 feet, one of the world's longest continuous escalators.

Parking garage where Bob Woodward met Watergate source "Deep Throat."

In one of America’s oldest mountain ranges, a long-awaited section of a scenic highway is now open to the public.

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

A recreation of the doomed ocean liner in the middle of the Smoky Mountains.

Labor provided by Great Depression-era programs restored these 25,000 acres in Tennessee.

Better known as the "Body Farm," this unique research facility has been studying how human bodies break down since the 1980s.

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

The Pentagon is so large that it was planned like a city, complete with internal highway infrastructure.

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

The final resting place of an unidentified revolutionary soldier sits behind a Virginia church.

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

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

This pun was simply waiting to come to life, and one defense contractor made it so.

Rumor has it the hot dog stand was targeted by two Russian nuclear missiles.

Poetic, metallic giraffes adorn a square off an Edinburgh thoroughfare.

Follow the original medieval paths that wind through this intriguing section of the city.