Louisiana is losing its coast at a rapid rate because of rising sea levels, development and sinking marshland. Officials are trying to rebuild those marshes and the wetlands, but much of the coast can't be saved. This makes Louisiana's history an unwitting victim. As land disappears and the water creeps inland, ancient archaeology sites are washing away, too.

Richie Blink was born and raised in Plaquemines Parish, La. — way down south of New Orleans along the Mississippi River. Now he works for the National Wildlife Federation.

When he was a kid, his dad showed him a special place in Adams Bay, where they'd go fishing.

"We would come out of the floodgates and my dad would say 'Head for the Lemon Trees!'" Blink says.

What's locally known as the "Lemon Trees" is a stand of weathered old trees on a grassy tuft of land. It's a well-known landmark for fishermen, but Blink says they would rarely stop there to hunt or fish because it's a sacred Native American site.

"The legend goes that you were always to bring some kind of sacrifice, so somebody left some lemons for the ancestors," Blink says.

And those grew into big trees with grapefruit-sized lemons. But as land was lost to the Gulf of Mexico, saltwater made its way into the freshwater marsh, killing off the trees and other plants.

The trees stand like skeletons on the edge of this scrappy, wind-beaten island. Waves beat against the dirt, washing it away, exposing shards of ancient pottery.

"You can see, it's just everywhere ... there's just shards of it all over the place," Blink says. "This is earthen pottery made by natives. This site is in the process of being destroyed. It only has a few more years left."

This ancient Native American site is an important archaeological find. It's one of many historic sites being forever lost to the Gulf as rising seas and saltwater intrusion eat away at Louisiana's fragile marshes. Two sites like this are lost each year.

When Blink saw how fast the land was eroding he decided to find an archaeologist and ask for help. That led him to Brian Ostahowski.

Ostahowski says he gets a lot of calls like this, at least once a month. People who say: " 'I have a great archaeological site in my backyard,' " Ostahowski says. "And chances are they usually do."

So he hopped in a boat with Blink and went out to the "Lemon Trees."

"Richie wasn't lying," Ostahowski says. "This is actually a very, very important archaeological site."

Based on the pottery and soil, Ostahowski says native people lived at the site 300 to 500 years ago. The pieces of broken pottery are probably from an ancient trash pile, called a midden. There could even be human remains there.

"You're talking about a whole ceremonial center that could tell you about lifeways, or the change of lifeways, that's going to be completely gone within 10 years," he says. "It maybe took 300 years of occupation there."

Three hundred years to build it — and in just 10 years it could be erased.

Ostahowski took samples of the soil for radiocarbon dating. Unlike the usual slow-paced archaeology dig, Ostahowski wants to excavate the mound as soon as possible and study the pottery shards and oyster shells.

But the truth is, there just isn't much time.

"We're talking about different ways that we can come up with kind of an emergency action, or emergency excavations," Ostahowski says.

He wants to learn more, like how long people lived there and how many different occupations there might have been.

These details could help fill gaps in our understanding of the prehistoric Plaquemine culture, which includes tribes that lived on the lower Mississippi before Europeans came.

For Blink, it's more than ancient history at stake. It's personal history, where he grew up.

He honors that in his own way, like two weeks ago when he brought out some lemons.

Under a windswept tree, on top of the small mound, a handful of dried up lemons sits in the shade.

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