If you're going to travel, you had better put one of these places on the list because they're not going to be here forever. A lot of them are actually more endangered than you think. Check out the list below. Time to book your next trip there!

Mendenhall Glacier

Located underneath the glacier in Mendenhall Valley, Alaska, it continues to melt every year.

Great Barrier Reef

The beautiful reef of Australia has suffered from rising temperatures and acid pollution, and its famed corals have turned white.

Sleeping Bear Dunes National Lakeshore

The dunes and beaches are threatened by invasive algae and mussels, not to mention rising phosphate levels.

The Grand Canyon

Due to increased development projects, and they could lead to the destruction of large parts of the Grand Canyon as well as its main water source, the Colorado River.

Congo Basin

The world’s second-largest rainforest in Africa has been disappearing quickly because of illegal mining. 2/3 of it will be gone by 2040.

The Maldives

The island nation in the Indian Ocean is slowly sinking, and could be completely submerged within 100 years.

The Dead Sea

The sea on the border of Jordan and Israel has sunk 80 feet and disappeared by a third in the past 40 years.

Seychelles Islands

It's slowly vanishing because of beach erosion.

Denali National Park and Preserve

6 million acres of Alaskan wilderness sprawl over this national park, including Denali, is being affected by glacier melt and reduced snowfall.

Great Wall of China

Nearly 2/3 of the Great Wall have been destroyed due to over-farming, natural erosion and the selling of bricks with historic engravings.

Glacier National Park

The glacier count has gone from 150 to 25, and it’s at risk of losing all of them in the next 15 years.

Taj Mahal

Experts say that the beautiful mausoleum in Agra, India could eventually collapse after years of pollution and erosion.

The Florida Everglades

Due to too many new species, too much water and urban development.

The Alps

Their glaciers are especially prone to sinking. Some experts believe that they could be gone entirely by 2050.

Petra, Jordan

The half-built city is one of Jordan’s biggest tourist attractions, but it’s been receding in the last century because of wind, rain and tourists constantly touching its walls.