On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Scattered throughout London are ancient remnants of the city's former bounding wall.

Largest lake in Great Britain measured by surface area.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

Few other hotels can rival the grandeur of the Castle in the Rockies.

The magic's in the hole!

This ultra-modern California span is actually a titanic solar clock in disguise built by famed architect Santiago Calatrava.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

An optical illusion found amid a logged redwood forest.

This massive redwood tree has a hole in the base big enough to drive through.

A trash dump made beautiful by nature's power.

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

An vast warehouse of everyday treasures in Berkeley, CA.

The century-old bell and clock tower at UC Berkeley is the third-tallest in the world, and has fossils.

Once the largest windmill outside of Holland, with enormous 114 foot sails.

A New England-style lighthouse along California's beautiful Highway 1 gets a re-do.

Haunting and beautiful trees, doomed to die.

A museum celebrating the self-taught artist-environment builder.

These Great Lakes sea caves accessible by boat in the summer turn into temples of ice reachable by foot in the winter.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

This bridge was the birthplace of a unit of measurement based on a fraternity joke.

This tea house was a hand-built gift from Boulder's sister city in Tajikstan.

A series of waterfalls and pools that flow through the 'Ohe'o Gulch and into the ocean.

Louise Bourgeois' 30-foot-tall steel spider sculpture.