Cedar Bog Lake, MN · Oct 16, 2023
Cedar Creek Ecosystem Science Reserve
Watch the world change, one visitor’s photo at a time.
255,355 photos at 1,390 places and counting.
Every visit adds a frame.

Take a photo
Set your phone in the bracket and send your photo.

Watch it change
Your photo joins everyone else’s in one timelapse.

Help look after it
The people who care for the place use Chronolog to see what’s changing.
See the difference.
Two visitors took these on their own phones, weeks or years apart. Chronolog lined them up.


A controlled burn clears the prairie, and it’s already greening back. See every photo
Every place has a story to tell.
Parks, nature centers, land trusts, and schools use Chronolog to watch seasons turn, restorations take hold, and places recover. Each one is open for anyone to explore.

Observation Platform
Blackwater National Wildlife Refuge · Maryland, US

Beach 7 Shoreline Erosion
Presque Isle State Park · Pennsylvania, US

Spokane Riverkeeper
Spokane Riverkeeper · Washington, US

Mather Overlook
Great Basin National Park · Nevada, US

Woodward Fire Photomonitoring Site 1
Point Reyes National Seashore Association · California, US
Live from the field
Someone just added a photo.
255,355
Photos contributed
1,390
Places
495
Organizations
14
Countries
Recent photos
NOV 14 2026Garden Ridge Trail - Pollinator Area
Lewisville Lake Environmental Learning Area · Texas, US
NOV 14 2026Humboldt Park Natural Area
Chicago Park District Natural Areas · Illinois, US
NOV 14 2026Overlook Trail
Hawn State Park · Missouri, US
NOV 14 2026Pitcher Plant Bog, Turkey Creek Unit
Big Thicket National Preserve · Texas, US
NOV 14 2026Inner Loop Woodland Restoration
Houston Arboretum & Nature Center · Texas, US
NOV 14 2026Golden Age in the Savanna
Phil Hardberger Park Conservancy · Texas, US
NOV 14 2026Bear Creek 1
Rogue River Watershed Council · Oregon, US
NOV 14 2026Wetlands from the Boardwalk Viewing Platform
Cosumnes River Preserve · California, US
NOV 14 2026Cedar Cliff Falls
Greene County Parks & Trails · Ohio, US
NOV 14 2026Minsi Lake
Friends of Minsi Lake · Pennsylvania, US
Meet the people using Chronolog.
Rangers, teachers, and volunteers at hundreds of organizations, and the visitors who add photos.
Organizations using Chronolog, and Chronolog in the news
Used by
In the news

Science Friday
Meet 3 Leaders Addressing Local Conservation Problems (opens in a new tab)
Helderberg Nature Reserve dam.

National Park Service
The Devoted People behind Big Data in National Parks (opens in a new tab)
Pine forest along Arizona Trail

PBS North Carolina
Using Hikers’ Cell Phones for Science (opens in a new tab)
Soundside Loop Trail

Yahoo News
Astonishing time-lapse video reveals dramatic impact of dam removal project (opens in a new tab)
Bonnie Park Dam Removal

LTER Network
Repeat photography engages the public at LTER sites (opens in a new tab)
Alpine Tundra Niwot Ridge LTER

WRAL News
Downtown Cary Park adds citizen science station (opens in a new tab)
Downtown Cary Park

For parks, nature centers, land trusts, schools & more
Give your place a memory.
Each person who stops adds a photo. Together, they show how your site changes.
- Up in an afternoon
- No power or Wi-Fi
- Full-resolution photos and video



























