A breathtaking viewing platform over the Alps.

The personal charnel house of Anton Bruckner.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

One man's personal kunstkammer, museum and shop.

Throughout this shopping mall are medieval ruins that were discovered during the mall's construction.

An existential riddle in the world's largest ancient castle.

What looks like a crashed Zeppelin is actually a bright, airy reading room perched atop a modern museum.

After sunset the heart of Zanzibar's historic Stone Town neighborhood transforms into a culinary playground.

These towering spires and glowing walls are carefully crafted from hundreds of thousands of icicles.

The longest eruption in the history of La Palma originated with this volcano in September 2021.

Not even a series of devastating fires could keep this odd castle in upstate New York from bouncing back.

This eclectic natural history collection holds everything from a bit of the trans-atlantic cable to Hemingway's marlin.

Hidden among the trees at the Rangeley Lakes Trails Center are more than 20 gnomes in small wooden houses.

The eccentric mansion of one the most popular horror authors of modern times.

This medieval tower is all that remains of the castle where Joan of Arc was held before being burned at the stake.

Home to three historic ships from the age of Vikings.

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

Nature took her revenge on the "Wickedest City in the World."

The water here is so clear you can see the mysteriously sunken ship from the surface.

It takes a nine-mile hike to reach these hot springs, but weary hikers are rewarded with stunning views and a warm soak.

Crossing this suspension bridge feels like walking through the sky, a fitting tribute to the head of the Apollo program.

A symbol of friendship between the mountainous regions of Switzerland and Bhutan.

For centuries no one knew there were hundreds of bones and precious artwork hidden beneath this Swiss church.

The largest underground lake in Europe.