An address that has never spent any coins hasn't revealed its public key. Public keys are hashed multiple times to get our addresses. Specifically, these are the steps of how we end up with an address:

1) We generate a 256-bit private key.

2) We, then, perform ECDSA to get our public key (compressed):
(Compressed means only the x coordinate. We don't have to carry the y since it can be calculated from y² = x³ + 7. Since y² returns 2 different values, we use the prefix 02 or 03 in front of the compressed public key to determine if y is odd or even)

3) We hash that compressed public key with SHA-256:

4) After that, we perform RIPEMD-160 hashing to the SHA-256 result:

5) Add version byte in front of RIPEMD-160 hash (00 for Main Network):

6) Again, SHA-256 to the previous result:

7) We hash the SHA-256 result with SHA-256 again:

8) The first 4 bytes of the last SHA-256 result is address' checksum:

9) Extend the RIPEMD-160 hash from part 5 with these 4 bytes:

10) Convert this to base58 and here you go:
[from bitcoin.it]

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Got a little off-topic, but anyway. As far as I know, you can find the uncompressed public key from the scriptSig of a transaction (P2PKH address).

You can do it pretty easily here: iancoleman.io/bitcoin-key-compression. You can also convert compressed public keys to uncompressed with the equation I mentioned above.