The world's largest frame offers spectacular views of the city's past and present.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Where the alchemists dream of transmuting base metal into gold was actually achieved.

A shape-shifting buy-sell-trade bookstore, born to Beatnik Era spirit.

An Orthodox church built by the Royal Family for the Russian community exiled to the French Riviera.

Museum celebrating the ocean, with the largest wunderkammer dedicated to sea exploration.

It's easy to see why this eclectic architectural wonder has been dubbed the "Spaceship House."

This opulent Pueblo Deco movie palace melds Art Deco and Native American motifs.

This sandstone mansion was the home of two of Oregon's most important pioneers.

Portlandia is the second-largest copper repoussé statue in the United States.

A sculpture of a salmon swimming through a brick building.

10,000 flowered plants bloom in the City of Roses.

The magic's in the hole!

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

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

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

The secret city built by the Manhattan Project.

Enormous lake at the bottom of a unique cave system.

Whitewashed mosque contains the world's largest carpet.

Hindu temple of the dead home to hundreds of long-tailed macaques.

On any given day this sprawling market houses literally tons of government-regulated gold, gems, and precious metals.

A preposterously luxurious hotel with gold-plated iPads, Rolls Royce chauffeurs, and a staff that trains by watching "Downton Abbey."

A towering spire in the fortress of Kalemegdan honors the victorious armies of Serbia during their struggles against the Ottoman Empire.