Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

An emerald-green grotto just a short trip from Austin.

This striking art museum holds an amazing series of curiosity cabinets.

A bizarre house filled with an astounding array of collections.

Running under an entire mountain, the longest highway tunnel in North America is kept fresh using portal fans and jet fans.

The king of U.S. high points towers over every other peak on the continent.

The little-known, 300-year history of the area includes former lives as a bustling tobacco port, parking lot, and industrial dump.

Washington's iconic carousel has a nice piece of Civil Rights history.

An easily overlooked memorial to a Ukrainian famine-genocide that killed over 4 million people.

Home to a vast and influential collection of Shakespeareana.

The "lovely red Vega" of the legendary record-settling pilot.

Perhaps the most scandalous statue of America's first president.

The actual model from the original "Star Trek" series is now on display at the National Air and Space Museum.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

This legendary urban waterfall creates a dazzling display of rainbows.

Take shelter from Hawai'i's tropical heat under the massive canopy of largest Banyan tree on the island.

Watch the newest land on the planet form before your eyes.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

Climb to the top of the world's largest seated bronze Buddha.

Teeming with illegal goods and services, this towering maze of vice is also a popular tourist accommodation.

Remnants of the most densely packed city in world history, that thrived on anarchy for 30 years.

Housing the famous Norwegian ice-defying 19th century polar exploration ship.

The design of this beautifully crafted building was inspired by Norwegian glaciers.

Across the Pacific in a raft, a museum dedicated to Thor Heyerdahl's now legendary expedition.