This funicular railway rumbles along for a mile up the nearly vertical face of Chattanooga’s Lookout Mountain.

Once decrepit and slated for demolition, now one of the longest pedestrian bridges in the world.

This historic train station has been converted to a locomotive themed hotel.

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

This museum pays tribute to the Cherokee leader who created a written language for his people.

A former Roman town that was once the home of Scipio Africanus.

This medieval city gate is now a blend of the past and the modern world.

Italy's third-largest Roman arena gives a peek into the underground operations beneath the ancient spectacles.

This magical-looking island is notorious for the misfortunes suffered by its owners.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

An underground paleo-Christian burial site composed of the remains of several cemeteries and Basilicas.

Skulls from the plague of 1656 and World War II bombings are united by a cult dedicated to caring for the ancient dead.

In a city that boasts four separate inclined cable railways, this is one of the busiest funicular lines in the world.

The tradition of open-air secondhand and antiquarian bookselling in Paris dates back to the Renaissance.

The only visible remains of this ancient Greek underground temple is its roof protruding from the earth.

Oldest building in California still in use.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

An abandoned town is hidden in Great Smoky Mountains National Park.

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

A 13th-century convent where St. Margaret of Hungary spent her teenage years.

This quiet, unassuming spot in Budapest was the birthplace of the bloody 1956 Hungarian Revolution.

A statue in Budapest's Liberty Square honors the former U.S. president's efforts to end the Cold War.

A random tree outside a Budapest hotel has become a DIY shrine to the late singer.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.