During the last 50 years thousands of Christians and Jews have prayed at the remains of a Roman fort in the city of Jerusalem, which was built to house the thousands of Roman soldiers needed to police the city during the time of Christ.
Why? Because they have ignored the words of Jesus in Matthew 24:1-3, and Luke 19:41-44, and they have also ignored recent archeological evidence.
Recently a Roman Amphitheater was discovered underground at the "western wall" of the fort.
Read the book "Temple" by Robert Cornuke, which reveals the work of Israeli archeologist Eli Shukron, who became famous for rediscovering the Pool of Siloam.
See the links below about the Roman Amphitheater and Roman Fort Antonia.
Archaeologists just discovered an ancient lost theatre near the Western Wall in Jerusalem
The Temple Mount and Fort Antonia
.
Here is an article to read regarding the third temple.
The most immediate and obvious obstacle to realization of these goals is the fact that two historic Islamic structures which are 13 centuries old, namely the Al Aqsa Mosque and the Dome of the Rock, are built on top of the Temple Mount. Israel has undertaken to ensure access to the Temple Mount for peaceful worshippers and visitors, while maintaining public order and security. Any efforts to damage or reduce access to these sites, or to build Jewish structures within, between, beneath, beside, cantilevered on top of, or instead of them,
could lead to severe international conflicts, given the association of the Muslim world with these holy places.
The second obstacle concerns the location of the temple. The Holy of Holies in the third temple must be on the exact same spot as it was in the two previous temples.
Therefore the temple must be built in the same location as it was before.
The Dome of the Rock is regarded as occupying the actual space where the Second Temple once stood, but some scholars disagree and instead claim that the temple was located either just north of the Dome of the Rock, or about 200 meters south of it, with access to the Gihon fresh water spring, or perhaps between the Dome of the Rock and the Al Aqsa Mosque.
In addition, most Jewish-Orthodox scholars reject any attempts to build the Temple before the coming of Messiah. This is because there are many doubts as to the exact location in which it is required to be built. For example, while measurements are given in cubits, there exists a controversy whether this unit of measurement equals approximately 1.5 feet (0.46 m) or 2 feet (0.61 m).[citation needed] Without exact knowledge of the size of a cubit, the altar could not be built. Indeed, the Talmud recounts that the building of the second Temple was only possible under the direct prophetic guidance of Haggai, Zechariah, and Malachi.
Without valid prophetic revelation, it would be impossible to rebuild the Temple, even if the mosques no longer occupied its location.
Despite obstacles, efforts are under way by various analytical groups to articulate the benefits to local and regional constituents and participants to encourage developments that would progressively align in support. It is known from the Talmud that in the time of King Agrippa, Jerusalem was filled with millions of visitors and pilgrims from the entire region. Today the potential of spiritual tourism would support the growth goals of the Mayor of Jerusalem for 10 million tourists annually. This would provide a significant boost to the economy and would benefit people locally and regionally, many of whom live in poverty. Since the rebuilding of the Temple can come only through a process of peace, it must be preceded by numerous efforts, including the financial and project infrastructures to support such a large increase in tourism, local and regional co-operation agreements to enable its construction
and the success of modern attempts to revive the Sanhedrin, the authority which must be empowered for such an event to occur.
(wikipedia)