The tallest structure in Italy is a remote radio transmitter in Sicily.

This Arabesque Italian castle was built with a primitive, if ingenious, air-conditioning system.

A mysterious ancient elephant said to possess magic powers is now the symbol of a Sicilian city.

These temples are among the oldest free-standing stone buildings in the world.

This unique building in the main square stands out among the city's typically Baroque architecture.

This subterranean necropolis holds three floors of antler-dug grave caves.

The final resting place of the great navigator, or maybe his brother.

Improbably, the largest wildlife refuge in the conterminous 48 states sits just northwest of Las Vegas, Nevada.

Along a California highway is a kind of Jurassic Park made of metal.

The freeway that never was.

Built for an exposition in 1915, these horticultural displays have stood the test of time.

L. Frank Baum wrote part of the "Wizard of Oz" series in this wooden Victorian beach resort.

This giant temperature attraction created some giant electric bills.

One small town in the Pacific Northwest transformed itself into a Bavarian-themed tourist destination.

An outsider art duo's yard has been turned into a whimsical public gallery.

This futuristic bridge is one of the longest self-anchored pedestrian bridges in the world.

A relic from a forgotten bakery chain still spins atop a diner.

One of Hollywood’s favorite government buildings.

A Masterpiece with a Tragic History.

The final resting place of a space program monolith, soon to be unveiled again to the public.

An L.A. traffic island where the faces of locals have been carved into massive granite eggs.

A massive volcanic plug is now a protected area that hosts a number of bird species.

Towering basalt columns, a creation of fire and ice.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.