There's no single agreed-upon "center of the Earth" on the surface—it depends on how you define it (landmass only? land + water? center of mass?). But several locations have been proposed based on different methodologies.
The true center of Earth's mass lies deep in the planet's core—about 6,371 km (3,959 mi) below your feet. Surface "centers" are symbolic, not physical. Still, visiting Quito's equator line—where you can stand with one foot in each hemisphere—remains a bucket-list experience.