Soaring almost 40 stories above the water, the majestic Hubbard Glacier makes even the largest of ships feel miniscule. Of more than 100,000 in the state, it claims the title of the longest tidewater glacier in Alaska. It’s an impressive sight at more than 75 miles long and six miles across at its widest.

While other glaciers have been in the news for melting and retreating, Hubbard has been doing the opposite. For over 100 years, it has been traveling down from its source in the Yukon, with no signs of stopping. Unbelievably, this massive natural wonder has moved at speeds as fast as 100 feet per day since it was put on the map in 1895.

As you cruise by Hubbard, take a glance into the past; the jagged outside edges of the glacier are made of over 400 year old ice. You may even be lucky enough to witness the birth of a new iceberg as it splits from the glacier and crashes into the bay with a roar that natives call “white thunder.”