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Neptune, Uranus, the dwarf planet Pluto, and all the exoplanets. 837 exoplanets had been discovered as at 2012-Sep-07. Mars, Venus, Jupiter, Saturn, Mercury and obviously Earth can be seen with the naked eye. All the rest were discovered by telescope. Seeing as we don't have warp drive, hyper-space or inter-dimensional travel, there is no other way to discover a planet except by observation. This is always done through a telescope, whether it be visible spectrum, IR, UV, radio etc

There is also some discussion that Neptune and Pluto were discovered by noticing the variation in the orbits of other planets. After the maths was done, telescopes were pointed at where we thought the source of the orbital variation would be, and Neptune and Pluto were discovered. So was the time of discovery, when we did the maths or when we first observed them through a telescope ... ?

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