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Yes, there have been probes sent to Mercury. Messenger and Mariner 10.
No one has every been to Mercury. The furthest man has been is to the Moon. Probes have been sent to Mercury
there has been 16 probes that had been sent to venus.
As of 2014, humans have not set foot on the planet Mercury. To date, the only probes sent have been Mariner 10 which did a flyby, and the MESSENGER orbiter; both probes from NASA.
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Yes, NASA has sent a couple of unmanned probes to examine Mercury, Mariner 10 which did a flyby and the MESSENGER orbiter.
Venus has no natural satellites but probes have been sent their for many years now.
They have already sent two probes near Mercury: Mariner 10, and MESSENGER. The BepiColombo is a proposed joint mission between JAXA and ESA, which will launch a further two probes.
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If landing probes are mentioned, no not yet.
Unmanned space probes have been sent to various destinations in our solar system, including Mars, Venus, Mercury, Jupiter, Saturn, Uranus, Neptune, and Pluto. They have also traveled beyond our solar system to study interstellar space.
Two spacecraft have been sent to Mercury: Mariner 10 in 1974 and MESSENGER in 2004. MESSENGER orbited Mercury from 2011 to 2015, providing valuable data on the planet's geology, magnetosphere, and surface composition. The European Space Agency's BepiColombo mission, launched in 2018, is currently en route to Mercury and is expected to arrive in 2025.