Patagonia Mountains, Arizona CNN  — 

Once there was a bustling construction zone here. Now it’s like a ghost town, frozen in time.

Heavy machinery is parked and motionless. Stacks of steel bollards stretch as far as the eye can see.

The Trump administration built more than 450 miles of fencing along the US-Mexico border – including hundreds of miles of replacement fencing and 52 miles of construction where there were no barriers before. The wall became a focal point of his presidency, a staging ground for political rallies and a symbol of the administration’s controversial immigration crackdowns.

On the campaign trail, President Biden vowed not to build another foot. And he swiftly halted construction once he took office.

A big question still hasn’t been answered, months into his presidency: What will happen at sites where construction was underway?

Fencing currently covers 706 miles of the 1,954-mile US-Mexico border. We recently visited four locations along that stretch where wall construction had started, but has been paused since Biden became president.

So far, the new administration isn’t saying what will happen next in any of these places.

But people who live and work in the area have a lot to say about what they want to see.

Here’s what we saw, and what they told us:

Stop 1: The view from the end of the road

This is about as far as the border wall construction got about 15 miles east of Nogales, Arizona, in the Patagonia Mountains. What you see now is a path carved through a pristine desert landscape.

It’s a scene that’s all too familiar to environmental activist Laiken Jordahl. A former park ranger, he’s spent the last four years campaigning against the border wall in these remote areas of Arizona.

Laiken Jordahl

Here’s how he describes the landscape:

Customs and Border Protection has said border wall projects went through “Environmental Stewardship Plans” to analyze and minimize the environmental impact, including studies of how wildlife may be affected by the projects.

Jordahl says he’s seen enough.

Stop 2: Tire tracks in the dirt, but no activity to be found

At Coronado National Memorial in Arizona, the tire tracks in the dirt are a reminder of the heavy construction equipment that was here just a few months ago.

Back in December, crews were feverishly working to finish erecting a stretch of wall here.

TOPSHOT - A crew works replacing the old border fence along a section of the US-Mexico border, as seen from Tijuana, in Baja California state, Mexico, on January 8, 2019. - President Donald Trump tells Americans in a primetime speech Tuesday that the US-Mexico border is in "crisis" and Congress must approve construction of a wall to end a government shutdown now in its 18th day. (Photo by Guillermo Arias / AFP) (Photo by GUILLERMO ARIAS/AFP via Getty Images)
Border wall construction presses on in Trump's final days
05:23 - Source: CNN

Now, the roads nearby are a blocked off, so we can’t get close enough to see what they built.

But this much is clear: The landscape in the area has already changed dramatically.

Border Wall Construction Lavandera

Stop 3: A scarred mountainside and a half-built wall

At Guadalupe Canyon, construction crews were busy at work the last time we visited. All you could hear were the sounds of heavy machinery, construction crews and explosive detonations blasting into the mountains. Now, it’s eerily quiet.

Construction has stopped. And you can see a scarred mountainside, a half-built wall and massive amounts of steel – seemingly abandoned. Now remnants of old steel border barriers are blocking access to the new wall.

Border Wall Blocked Abandoned Construction