Try NEAR Explorer
You can view the current blockchain in real time as well as interactions between users and smart contracts.
Navigate to https://explorer.testnet.near.org/ in your browser to see information on specific blocks and transactions from those blocks. This is a useful tool when you are trying to debug your contracts.
Navigate to https://explorer.near.org/ in your browser to see information on specific blocks and transactions on the NEAR MainNet. Remember that this is only going to reflect apps, accounts and services that are in production!